* CastingGag: Ryan Stiles (known for shows like ''Series/WhoseLineIsItAnyway'') visits in one episode to teach everyone how to do act during undercover work, but it ends up being a lesson on improv.
** In one episode, Dangle gives two prostitutes an improv lesson when their "two-girl show" isn't convincing.
** Originally, this was supposed to be on FOX, but FOX rejected it, as they didn't think it was funny and people would confuse it with ''COPS'' (which isn't a comedy -- at least, not an intentional one).
** A second movie, where everybody gets stuck on a deserted island with a serial killer on the loose (also showing flashbacks of the Reno squad's beginnings), was written as a treatment but the middling performance of the movie in theaters led to it not getting produced. The treatment can be read in Robert Ben Garant and Thomas Lennon's book ''Writing Movies for Fun and Profit''.
* YouLookFamiliar: Creator/PattonOswalt has played three different characters. Paul Rudd and the comedy troupe Stella have played two characters.
** The deputies frequently play perps on the show with their faces blurred.
** Mary Birdsong played a masseuse in one Season 2 episode, then became a regular castmember as Deputy Kimball one season later.
** Cathy Shim played six different characters in seven guest appearances, and played still another character in TheMovie.
** Every member of ''Series/TheState'' appeared in the show, either as a regular cast member or in a cameo.
** Toby Huss, who usually plays Big Mike, also appears as a Civil War reenactor in "President Bush's Motorcade" and as a creepy motel clerk in Reno 911: Miami.
** Ken Marino has played three different characters - one perp and two different cops.
** Nat Faxon who plays the milk shake man is also a head shop clerk/undercover DEA agent in season 1's "Burning Man Festival".