The Egon Gun was named after Egon Spengler (played by Harold Ramis) from the movie Ghostbusters.The early version of the character (from 1997) was based on Don Knott's appearance. The generic security guard character was named after Barney Fife (played by Don Knotts), a fictional character from The Andy Griffith Show.This is a reference to The Onion, a satirical news website. A newspaper bearing The Onion's logo and title can be found in the trash cans gibs ( garbagegibs.mdl).It is also used in the Gearbox expansions. It can be seen in the security office in 'We've Got Hostiles' (map c1a3), and in the Hazard Course (map t0a0d). Homer Simpson works at Sector 7G in the Springfield Nuclear Power Plant. The door texture C1A3SECDR02 contains the text 7G, which is a reference to The Simpsons.