- Actor Allusion: Marcus will sometimes say "I am not a merry mutant", in reference to the Star Trek: The Next Generation episode where Q shoved the crew into a Robin Hood simulation, whereupon Worf commented, "Sir, I protest, I am NOT a merry man."
- Contest Winner Cameo: The patch renames the Arroyo villagers Dumar and Standing Fist to Cameron and Lucas respectively, after Cameron Rapmund and Łukasz Kawarski, the winner and runner-up of the official Fallout trivia challenge.
- Cowboy BeBop at His Computer: Some reviews written around the time the game came out (and for a long time, the "Reaction" section of the Wikipedia article) mentions that having the mutants be created by genetic engineering instead of radiation-induced mutation betrayed the 1950's pulp feel of the original game. However the FEV is mentioned in the original game, and is an important part of The Master's backstory (though it's possible the reviewers didn't bother going down farther into The Glow than they had to; the computers containing this information are on the lower levels.)
- Creator Backlash: Chris Avellone has expressed dissatisfaction over how Denser and Wackier the game ended up being, and has suggested that fans not take certain elements as canon.
- Executive Meddling: The publisher, upon seeing the finished game, demanded that a tutorial level be included, and the developers were forced to rapidly knock one out literally days before release. The universally-loathed Temple of Trials was the result.
- Throw It In!: The Bozar was intended as just a powerful sniper rifle. It was accidentally set to be able to do burst fire during development, and the developers felt the "automatic sniper rifle" was fun and left it like that.
- Unintentional Period Piece: Some of the fourth-wall-breaking jokes targeting issues like the Monica Lewinsky scandal, Dan Quayle's bad spelling and Mike Tyson's ear biting make it painfully obvious the game was released in 1998.
- Urban Legend of Zelda: Sulik's sister spawned many persistent rumors that she was hidden in the game somewhere, often said to be in a rare random encounter or hard-to-find slave pen. Sulik's tribe also spawned similar rumors. They cannot be found in the final game, though mods exist to add them in.
- What Could Have Been: The developers had planned an even bigger game that what was shipped, but many things got the axe before release due to an accelerated development schedule and some ideas just not working out. Most of these were added back into the game in the Fallout 2 Restoration Project Game Mod.
- A good ending for the Vault 13 Intelligent Deathclaws was planned, but was cut due to conflicting with the Enclave plot. Gecko and Vault City has several endings related to each that were cut or prevented from playing due to scripting bugs. The Hubologists were meant to have three different endings related to their shuttle, which was also meant to be a location the player could visit.
- Several locations were cut. Most prominently Sulik's tribe. Also cut was the Abbey, a monastery with monks guarding pre-war knowledge in a Shout-Out to A Canticle for Leibowitz, and the Environmental Protection Agency. a pre-war underground base nearby New Reno that would have featured unique game mechanics and items. Myron still alludes to the EPA in the final game, and several concepts related to it were later used in the Fallout: New Vegas DLC Old World Blues.
- A 3D "talking head" model for Cassidy can be found in the files, indicating he was meant to be a voiced character at one point. Ian from the first game was planned to show up at the Abbey. When the location was cut, he was cut along with it.
- More pre-rendered videos were planned for events like getting the car and the desert transaction outside New Reno, but were cut due to a lack of time and disk space concerns. Numerous titles and addictions for the player, such as the Virgin of the Wastes title, portraits for each Karma level, and alcohol and Tragic addiction were scrapped due to time or scripting bugs. A food system was also considered, but ultimately cut from the game.
- Sulik's tribe and his sister Kurisu were intended to be seen in-game, but were cut early enough that the developers had very few details worked out about both before scrapping them. The cancelled Fallout: Van Buren would have featured Kurisu as a possible party member.
- Many random encounters were cut. Most notably a series of encounters with Kaga, a previous candidate for being The Chosen One who had been exiled from the tribe and planned to be a recurring threat throughout the game. Others include a second encounter with King Arthur's Knights (which is still in the game files and stopped from playing due to an oversight), a Renegade Brotherhood member who would've pulled a Big Damn Heroes in your favor against an ambush of lobotomites (the lobotomites themselves were cut from the game), and the Federation Crash Site encounter having a "Phazer" weapon along with the hypos.
- Many useless and/or niche items were meant to be parts of quests or alternate solutions that were cut out of the final game. These include using the Radscorpion Limbs to expose the Duntons as cattle rustlers, using the Heart Pills to cover up the murder of Westin or using them to fix Cassidy's heart issues, and planting the Marked Cards on a con man named Three-Card Monte in New Reno. Fannie Mae in Redding would have had a quest line related to her Jet addiction, with the player having options to help clean her up or cause her to overdose by supporting the addiction. Several quests related to the Hubologists and the Shi were cut out, along with a third area of the Den and a related quest to establish an orphanage for the Den's children to stop them from stealing. The Gekko reactor keycards were intended to work on the doors at the Enclave base.
Trivia / Fallout 2