Near the NN-03d SatCom array, a door can be found built into a rock; Upon opening it there is a wall with "Fuck You" written in green paint.

In the corner of the map, you can find a building called the Dunwich Building. This building is named after the H. P. Lovecraft story, The Dunwich Horror. The building also takes inspiration from other Lovecraft stories like the Cthulhu mythos.

"The Plunger Room of Death" is a small area unmarked on the Pip-Boy world map. It is located South of the Chryslus Building, and East of Farragut West Metro Station. The entrance is a door underneath an intact bridge. Inside are dozens of toilet plungers and bloody hand prints on the walls.

A small, playable text adventure called 'Reign of Grelock' can be accessed from a terminal in Hubris Comics.

Inside the basement of the Capitol Post building located in L'Enfant Plaza, there is a corpse named "Gibson". Gibson's inventory has four items, two of which are "Gibson's Key" and "Gibson's Scrap of Paper". The scrap of paper has the following message, "Search the house!"

This references an early scene in Snatcher where the player finds Jean Jack Gibson's corpse and discovers a key and a scrap of paper with the "Search the house!" message among his belongings.

In Fallout 3, and New Vegas, a weapon can be found called the Fat Man, a Tactical Nuke Launcher.

When you fire it, it throws a mini nuke ahead of you at the enemy. When you reload you hear a "ding" sound to indicate it has finished reloading.

The bell heard is actually the Bethesda lunch room bell.

According to former character artist Jonah Lobe, the response from Fallout fans and the fan website "No Mutants Allowed" to Bethesda purchasing the series from Interplay Entertainment and developing Fallout 3 consisted of "a lot of excitement, a lot of enthusiasm, and a lot of death threats." Lobe claimed that while he and other employees at Bethesda were not "privy" to most of the details on the threats due to the company shielding them from its workforce, as a result of the overwhelmingly vocal and mixed responses from fans, Bethesda had to hire a security guard for the first time in its 21-year history.

In the Broken Steel DLC, in the cutscene used for when the player character travels on the Presidential metro, the moving train is not a separate entity programmed to move on its own due to limitations with the Gamebryo engine. Instead, when the player goes on the metro, a script is triggered that equips an NPC underneath the train with a glove that turns its right hand invisible and produces the model for the Presidential metro car on top of it appearing like a giant hat. This then triggers an animation of the NPC's model sitting down and gliding along the ground in an arc that simulates the metro riding along the subway tracks.

Rivet City's Abraham Washington is the name of this NPC and is a reference to two former United States Presidents, George Washington and Abraham Lincoln.