According to sound design supervisor Paul Lackey, the "hit-pip" sound played when you successfully shoot another player was created using the sound of a beer can opening.

According to Lackey:

"Another extremely challenging sounds was the 'hit-pip.' When you hit someone, you need to know you made contact. The sounds needs to cut through the mix but not feel like it comes from any hero. It went through tons of iteration. Finally, one night I thought, 'It should be satisfying to hit an enemy.' Just think about what's satisfying: beer. So I literally opened a beer can. Pssht. The sound is reversed and tweaked a little, but that sound is our hit-pip."

The development crew working on the previous Titan project (the precursor to Overwatch) once received a frustrating constraint from higher-ups that banned the use of flying cars in their game. As a cheeky response to this, Overwatch Director Jeffrey Kaplan decided that every car must fly in Overwatch.

In the Temple of Anubis stage, the spawn zone vehicle features what appears to be artwork drawn on its hull of a Murloc from Warcraft with its signature "Mrglrglrlgl" noise written below. Inside the same vehicle, there is a trophy of a Hydralisk from the StarCraft series.

In the barracks of the Watchpoint: Gibraltar stage are lockers with the names of the game's Environment Art team: (Helder) Pinto, (Dion) Rogers, (Philip) Klevestav, (Andrew) Klimas, and (Bram) Eulaers.

During early concept stages of the game, Hanzo and Genji were once originally the same character, a cyborg ninja named Hanzo that wielded both a sword and bow. As time went on, Hanzo was split into two characters, with Hanzo using the bow and arrows, and Genji who was given the cyborg ninja motif and sword.

The two songs that Lúcio plays during his Crossfade ability have been officially released by Blizzard onto Soundcloud under the album name "Synaesthesia Auditiva". The speed-boost track is called "We Move Together As One" and the healing track is called "Rejuvenescência".

The coffee shop in Eichenwalde lists "Kosakezipfel" on its menu. This is a reference to Loriot, a German comedian. "Kosakenzipfel" is a fictional dessert that originates from one of his skits and roughly translates to "Cossack's Cusp".

During Overwatch's beta, a pose for Tracer was removed after some beta testers deemed it to be too needlessly sexualized. The pose which replaced it is an homage to a work by Alberto Vargas, a pin-up artist.

D.Va's first design could be seen on a wall piece at one of Blizzard's events. Since every other character on the piece sports their final designs, this would suggest D.Va was one of the last characters from the original roster to be finalized.

In the escort level Route 66 during the game's beta, there were magazines featuring the characters Symmetra and Mercy littered inside the outhouse, suggesting that members of the Deadlock Gang who reside there masturbate to them. The magazines were later removed in a beta patch.

In the Overwatch Cinematic Trailer, a security guard can be seen playing Hearthstone on a tablet device.

Overwatch was born from the remnants of Titan, a sci-fi MMO Blizzard had been working on for years but ended up cancelling.