In Chapter 3, if a battle against a Shadowguy lasts for at least four turns, the Shadowguy will have a 1% chance of having his attack replaced by a text box reading: "This bullet pattern has been censored by the MPA." In the Japanese version, the reference to the real-world Motion Picture Association is replaced with a mention of the "BBPO," likely a misspelling of BPO, the Broadcasting Ethics and Program Improvement Organization.

Within the game's data are walking and portrait sprites for Sans, a character from Undertale, associated with the Wild East area. According to programmer Spasco, these are remnants of a cut Fun Value event where Sans could appear as a patron in the Wild East's saloon, attempting to sell his seat to Clover for 30 G, then 300 G, before walking away. The game's art book elaborated that this event was first added as an in-joke for playtesters. Despite Spasco's desire to keep it in the final game, the event was ultimately cut because "it would've raised too many questions and implications for the story." The art book additionally contains sketches for an alternate version of the event where Starlo appears, asking if Sans is bothering Clover before Sans decides to leave of his own accord.

According to an "Ask the Developer" interview, there was internal debate on whether or not the remake should add a manual jump button, which was scrapped from the original version. They decided to implement it due to most modern players (such as those who played The Legend of Zelda: Breath of the Wild) having gotten used to Link being able to jump manually. Because of this, the way the jump attack functioned was changed to have two different methods of usage: one where it functioned the same as the original, and another where it could be done by pressing the attack button while jumping. This was due to the dev team being unable to decide on which method was better.

In Chapter 3, after Spoiler:Kris completes the final round of the Original Game on the Sword Route, Susie recounts Ralsei's experience growing frustrated at another video game in the Green Room. Afterwards, Ralsei states that "I was not very chuffed by that dart" in reference to an arrow hazard that appeared in the game. Later, in Chapter 5, Ralsei and Yellow's break in Flower Castle's cafe opens with Ralsei asking if Yellow has "any smoked herbs? Like, oregano," which Yellow misinterprets as "smokin' herbs." Both of these dialogue sequences reference a crude drawing of Ralsei smoking an oversized marijuana joint (traced over a preexisting edit of Super Mario 64 artwork) posted by Twitter user nlotch in 2021, which became a widespread internet meme following the release of Chapter 2. The Chapter 3 dialogue's wording additionally references a 2016 Facebook post by the account "Animals smoking Durrys", describing a centipede gripping a lit cigarette as "chuffin back a fat dart".

If the player loses the boss fight against Bane, one of the Game Over sequences that plays is Bane lifting Batman over his head and breaking his spine down on his knee. This is a reference to the 1993-1994 story arc "Knightfall"; the incident specifically took place in Batman (1940) issue #497.

Following its release, the fangame Undertale Yellow attracted public debate due to its soundtrack's use of preexisting songs and leitmotifs from Undertale, which caused videos and other related content to attract copyright claims from Materia Collective, the company which owns the rights to Toby Fox's music. Following a tweet at the start of 2024 where the developers explained that they would be working with Fox and Materia Collective to resolve the issues, Materia Collective CEO Sebastian Wolff posted a thread of his own claiming that the developers had failed to properly secure the necessary trademark, asset, and mechanical licenses needed to use the original game's music. When another user stated that Fox had provided "clearly defined permission for [Undertale's] music to be used" at the start of development in 2016, Wolff contested the claim, pledging to donate $10,000 to the developers if anyone could provide legally valid evidence of this that covers the full scope of alleged rights violations.

This prompted Fox himself to issue his own statement, relayed by Undertale Yellow's Twitter account on his behalf, stating that although Wolff was right in that they failed to secure permission "until very recently," he considered Wolff's bet to be "extremely unprofessional in a way I shouldn't have to explain." Fox revealed he had spoken to Wolff privately about the situation and advocated to help do right to well-meaning fans who made a mistake. Fox additionally revealed that he donated $20,000 to the nonprofit disability charity AbleGamers, as requested by Undertale Yellow's developers, to apologize for the fiasco, and stated that he would try to more concretely lay out the rights and licensing guidelines for Undertale's music in the future.

The limited edition of the Xbox 360 release of the game came bundled with a CD of the game's soundtrack, and a "mini massage strap" (a small wand vibrator that can be attached like a keychain) as pre-order bonuses.

On March 31 and April 1, 2003, seven young men in the city of Sturgis, Michigan placed at least 32 signs around local businesses, schools, banks, the city hospital and post office quoting a line from Zero Wing's infamous English translation as an April Fools' prank: "ALL YOUR BASE ARE BELONG TO US, YOU HAVE NO CHANCE TO SURVIVE MAKE YOUR TIME". Although it was a popular internet meme at the time, residents were not familiar with its origins and took offense. Sturgis Police chief Eugene Alli explained that the signs could be "a borderline terrorist threat depending on what someone interprets it to mean", and reported that the police station received numerous calls from concerned citizens and business managers about the signs, interpreting them as a homeland security threat related to the War on Terror. The group was arrested and charged with disorderly conduct, and released apologies to the press.

During Chapter 5, when Spoiler:several members of the Van Der Line gang end up shipwrecked on the tropical island of Guarma, Dutch and Arthur will be held at gunpoint by the local authorities. When questioned for his name, Dutch will give the false alias of "Aiden O'Malley", a direct reference to the character of the same name from Grand Theft Auto IV.

Using console commands, a player can re-enable the cut "Child at Heart" perk, originating from Fallout 3. Doing so reveals cut content which would have allowed a player to obtain the unique weapon Euclids C-Finder from Max in Freeside by passing a dialogue check with this perk. Max uses the line: "Reach for the sky, Mister!", referencing the Pixar film "Toy Story", but if Child at Heart was enabled, the player character's dialogue would consist of a second follow-up reference, this time to Buzz Lightyear.

A Kombat Kode (717-313) will display a message on-screen before beginning a fight which states: "RAIN CAN BE FOUND IN THE GRAVEYARD". As the ninja character Rain was only included in the game's coin-op arcade version as a prank by director Ed Boon, the Graveyard stage would have originally included rainy weather effects but was cut from the final release. This planned effect was able to be recreated after raindrop sprites were found in a 2023 source code leak.

During a cutscene early in the game's story, Daxter and Pecker get into a spat while Jak is confronting Damos following his victory in the Spargus City arena, concluding in Daxter gesturing towards Pecker where he appears to be flipping him off. In the final retail version of the game, the way this scene is shot obscures the gesture from view, but by using free-cam mods on an emulated version of the game, it can be seen that Daxter does indeed flip off Pecker, but with two fingers as opposed to just the middle digit (the middle finger equivalent in certain countries beyond North America).

Activision originally wanted players to have the ability to step on civilians, but the game's director Jon Burton pushed against this, feeling it was too violent for younger audiences.

The game's director and programmer Jon Burton recalled that crunch work had become very prominent during the last four months of development; he worked 19 hours a day, 7 days a week. This experience motivated him to leave programming and focus strictly on directing game development.

According to director John Gelardi, the game's title is a reference to the origins of the word "dinosaur", which is derived from the Greek words "deinos" (meaning terrible) and "sauros" (meaning lizard). WDR Studios felt this name was appropriate as it appeared to have never been used before for a dinosaur-centric horror game.

Three weeks prior to Grand Theft Auto VI's release, the animated series South Park included exclusive footage from the game as a gag and plot device in the season 29 episode "Guinea Pig on a Stick". The footage showed Jason picking up freshly laid dog feces at Vice Beach and slapping it in a bystander's face. Rockstar Games received a Special Thanks credit at the end of the episode for providing the footage.

Datamined character data files reveal that a Spiny, a Thwomp, a Blooper, a Ninji, a stack of Goombas, a Chain Chomp, a Fuzzy, a Banana Peel, and an unspecified "bird" racer were all seemingly planned to appear in the game's base roster, but were cut.

In Chapter 4, during Susie and Noelle's conversation in the Holiday manor's basement, Noelle mentions being reminded of "this guy that gets really mad about games... and he made this goofy horror series... about this bucket with ICE-E's face that tries to kill him?" This references two different web shows by YouTuber James Rolfe: The Angry Video Game Nerd, in which the title character profanely reviews video games of oftentimes poor quality, and Board James, one episode of which depicts the title character and Mike Matei being menaced by a sentient version of the toy Mr. Bucket.

The in-game version of the 2025 Jamie Paige & OK Glass song "BIRDBRAIN", first created for UNBEATABLE's DLC pack THE JAMIE PAIGE CONTENT COMPANION and later featured in Fortnite, is based on a radio edit that Paige put together for her appearance on the WNYU series Vocaverse. While the song is mostly identical between the radio edit and in-game edit, replacing all instances of "fuck" and "shit" with chicken noises to abide by FCC and ESRB guidelines, the censored version of the song's bridge is re-recorded for the in-game rendition. In the radio edit, Paige notes that the Vocaloid voice bank used for the song, Kasane Teto, "can't say ['my penis'] on the radio... unless it's in Australia," referencing an incident where the uncensored version of "BIRDBRAIN" was played on Australian radio station Triple J. The in-game version, meanwhile, has Paige scold Teto by pointing out that "this is a video game, the ESRB will have our heads," referencing a prior instance where music in UNBEATABLE had to be censored to avoid an M rating.