Trivia: Director Mike Judge wanted the story to be able to take place anywhere, so the state is never specified. Even the license plates on the cars are stateless.
Trivia: The Mexican waiter at the end of the movie tells Milton 'Lo siento mucho, pinche gringo.' This translates as 'I'm very sorry, you f***ing gringo.'
Trivia: To date, at least 5 different companies named Initech have been founded since the film's release.
Trivia: Director Mike Judge has a cameo in this movie. He is Stan, Joanna's boss at Chotchkie's. In the end credits, he is listed as "William King."
Trivia: The stunt driver in the car crash scene is Chuck Norris' son, Eric.
Trivia: Although the movie is written in a way that the story could take place anywhere in the US, the perceptive Dallasite can pickup on some local landmarks as well as the writers tossed in one indicator with the line by Diedrich Bader "I've got to haul my ass up to Las Colinas every day this week, I'm doing the drywall at the new McDonald's." Las Colinas is a suburb of Dallas where many films have been shot over the years.
Answer: They never told Milton he was fired, they just cruelly cut off his paycheck, figuring he'd eventually get fed up and leave (he'd actually been laid off years ago, but a payroll glitch kept him getting a paycheck). The management is hoping if they're cruel enough, he'll stop showing up.
Brian Katcher
This is actually the reverse of what happened. The glitch caused him to continue to receive a paycheck, even though he'd been laid off. The "Bobs" corrected the glitch, so he would no longer receive a paycheck. In an effort to avoid confrontation, they chose not to say anything to him, hoping he'd realise it and leave on his own.