Jimmy: It's not like I was faking the Apollo moon landing, now THAT was a big deal.
Jimmy: Nothing, I gotta go.
Dave: You picked a hell of a time to start working.
Matthew: Oh, I'm not working, I'm so worried about Mr. James that I'm just randomly hitting keys.
Dave: Well, be careful you don't accidentally write something.
Lisa: Sir, what is your current position?
Jimmy: Alright for the last time, I'm up in a balloon!
TV Anchor: Where are you now sir?
Jimmy: I'm up in a balloon!
At the end of the episode, when Bill (Phil Hartman) tells Dave that he's gone back to using (nicotine) patches, it's a reference to the first season's third episode, where Bill tries to quit smoking.
In the final shots of the episode, Bill gets curious and tries to use the nicotine patch like it was a piece of chewing tobacco. The last show is an ambulance racing down the street, presumably taking Bill to the hospital. Though this wasn't the last episode of the season, it was the last one NBC re-ran before airing season 5's premiere, "Bill Moves On," where it's revealed that Bill died at his home of a heart attack. ("Bill Moves On" was written after Phil Hartman's tragic murder, which occurred before shooting began on season 5.)
Jimmy: Using a lot of people is exactly what went wrong back in Dallas.
Probably a reference to the John F. Kennedy assassination and the various conspiracy theories involving it. These ideas were depicted in great detail in Oliver Stone's film JFK.
Bill: Who's on first?
Jimmy: I don't know.
Bill: Third base!
Bill and Jimmy engage in an impromptu recreation of Abbott and Costello's famous Who's On First comedy routine.
Jimmy: In the grand tradition of Phineas Fogg...
Jimmy is referring to the lead character of Jules Verne's novel Around the World in 80 Days, an eccentric and rich Englishman who takes a bet he can circle the globe in 80 days. However like so many other people, Jimmy actually gets the name wrong. The character was Phileas Fogg.
Bill: Looks like I picked a hell of a day to stop smoking.
Bill quotes Lloyd Bridges' performance as McCrosky in the 1980 hit comedy Airplane. In both cases a high pressure situation involving air travel causes the character to revert to self destructive behavior.
Jimmy: Riddle me this, boy wonder...
Jimmy channels Frank Gorshin's performance as the Riddler on the Batman TV series.