* ActorAllusion:
** [[{{Lois and Clark}} Dean Cain]] guest stars in one episode as the owner of the casino. He spends two hours walking around in disguise. James Caan's character, meanwhile, had spotted him on the security cameras from the beginning, and comments [[{{Superman}} "Does he really think a hat and a pair of glasses can make him invisible?"]]
** Vincent Ventresca and Paul Ben-Victor guest starred as a quirky duo, echoing their dynamic from ''Series/TheInvisibleMan''.
** Ed Deline asks Danny and Mike if they've seen ''Film/TheGodfather'', and then quotes the famous line "keep your friends close, and your enemies closer". Ed is played by James Caan, who played Sonny Corleone in that film.
** Josh Duhamel (Danny [=McCoy=]) gets two alluding to his relationship (later marriage) with Fergie, a member of the Music/BlackEyedPeas. When the band guest stars in the show, she refers to Danny as being hot when she sees him. In a later episode, Danny sees a poster of her hanging in a teenager's room and comments on it.
* TheDanza: Wheelchair-bound security specialist Mitch played by real life paraplegic actor Mitch Longley.
* HeyItsThatGuy: Even leaving aside all the guest stars, the main cast is very familiar, with the likes of [[{{Film/Transformers}} Capt. Lennox]], [[Film/TheGodfather Sonny Corleone]], and MagnumPI as the frontliners.