* ActorAllusion:
** There's quite a few jabs at Creator/WilliamShatner's iconic Captain Kirk role, such as when Denny is given a cellphone by one of his many girlfriends and it makes the ''Franchise/StarTrek'' communicator beeping sound whenever he flips it open.
** Also, when describing a parasitic water bug,
--->'''Alan:''' They call them cling-ons.
--->'''Denny:''' Did you say ''Klingons''!?
** The third season episode "Son of the Defender" used footage from the 1950's Defender TV movie featuring Shatner to present Denny as a young attorney clashing with his father. It was surprisingly emotional.
** In one episode, Valerie Bertinelli appeared as a guest character, and her appearance was heralded with the theme from ''Series/{{One Day at a Time|1975}}'', the show that made her a star.
** When Jeri Ryan appeared as Courtney Reece, it was mentioned that Reece's favorite restaurant in LA is the Ortolan. In real life, the Ortolan was owned by French chef Christophe Eme and his wife...Jeri Ryan.
** Notably averted with the addition of John Larroquette to the cast. His most well known television role, that he won four straight Emmy's for, was as a snarky, lecherous, ButtMonkey DA on a zany sitcom, the type of character that would fit right in with the rest of the cast. So, of course, he plays the sober straight man to the rest of the cast.
* ActorSharedBackground: Denny Crane's larger-than-life persona, and his anxieties about being washed-up. One could argue that Shatner fits that bill and in many ways Denny is a reflection of himself. Especially Denny doing Priceline commercials. David E Kelley mentioned wanting William Shatner for the role precisely because he would fit perfectly and was willing to poke fun at himself.
* FakeAmerican: Canadian Creator/WilliamShatner as staunch, gun-loving Denny Crane.
* IAmNotSpock: For a lot of people, this show was responsible for Creator/WilliamShatner not just being Captain Kirk. In fact inverted, now people make Denny Crane jokes about old ''Series/{{Star Trek|The Original Series}}'' episodes.
* IWantYouToMeetAnOldFriendOfMine:
** Heather Locklear, one of William Shatner's old friends from the days they costarred in ''Series/TJHooker'', played Denny Crane's client. Unfortunately the show was cancelled before [[Franchise/StarTrek Spock]] could agree to do an appearance.
** Christian Clemenson, one of James Spader's old friends, played Jerry Espenson.
** Armin Shimerman plays a judge in the first few episodes of season 3. In one scene, he and former ''Deep Space Nine'' castmate Rene Auberjonois face off with all the chemistry of the Quark/Odo exchanges.
* YouLookFamiliar: John Larroquette, who plays Carl Sack, earlier played MagnificentBastard Joey Heric on ''Series/ThePractice'', from which this show spun off.
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