Maura Tierney was added to the cast the day before they shot the pilot.
WNYX is at 585 on your AM dial.
Jon Lovitz has appeared as three different characters: - A guest appearance as a mental patient who befriends Bill McNeal - A guest appearance as a suicidal man perched on the ledge outside Dave's window - As Max Lewis
Ray Romano was originally cast in the handyman role.
In the pilot episode, the role of Catherine Duke was played by Ella Joyce. In all later episodes, the role was played by Khandi Alexander.
The room that is the production studio in the pilot episode is the break room in the rest of the series. (except episode 4)
In episode 3.22 "The Real Deal" Jerry Seinfeld is saying Phil instead of Bill when he is talking to Bill McNeal. Bill is played by 'Phil Hartman'.
The show was on brink of cancellation every season that it was on.
Some episodes are named after Led Zeppelin albums.
The filming of episode 5.1 "Bill Moves On" (the first episode filmed after Phil Hartman's death) had to stop several times due to the cast members crying.
In episode 2.21 "Led Zeppelin II," the WNYX building is revealed to be at 59th St. and Madison Ave., and is called the "Criterion Building."
During the credits, Dave Foley's name is shown over a shot of the twin towers of the World Trade Center. The towers were nicknamed David and Nelson. Foley's character is named Dave Nelson. According to Paul Simms, the shows creator, this is just a coincidence.