There's also "The Snow Job," which reunites Christian Kane with fellow Angel evil lawyer alum Sam Anderson, as well as Danny Strong from Buffy the Vampire Slayer. Not to mention Mark Sheppard popping up all over the place.
How can you look at Mark Sheppard without thinking of Crowley?
British viewers might recognise Gina Bellman from Coupling, and a handful of people might notice that Aldis Hodge played Voodoo Tatum in Friday Night Lights. Or recognize him as Jake, the soldier who killed Sam from Supernatural.
Lampshaded in "The 12-Step Job" when Nate refers to an old gentleman in his rehab group as Nick Nolte. Uncredited, unconfirmed, but if it's not him, then it's a subversion rather than a lampshade, as none of the other cases are recognized.
Moreau, the Big Bad arms dealer the team is tracking in Season 3, turns out to be none other than Luka Kovac.
A few from "The Ten Li'l Grifters Job" - the mark is Mr. Matthews. His daughter is Jordan. The cop is Steven Flynn, who Firefly fans will recognize as the captain who attempts to steal Serenity in "Out of Gas."
Hey, look! Paul Kinsey is in "The 15 Minutes Job" and hasn't aged a day!
If one listens closely then he/she can figure out that the prison head from "The Jailhouse Job" is Spy, though his voice is the same as when he played the helicopter pilot. By extension he's also the Pyro.