When Nate pretends to be Sophie's lawyer, he uses the alias "Jimmy Popodokolos". This is the same name he used during the con he and his crew ran in, in which his cover was also as a lawyer. Both episodes were season 2 and season 3 episode number 9,
Eliot and Hardison use the aliases "Officer Moffat" and "Officer Davies". When this episode originally aired, Russell T. Davies was the outgoing and Steven Moffat was the incoming showrunner of Doctor Who (2005). Moffat also created the sitcom Coupling (2000) and the drama Jekyll (2007), both of which starred Gina Bellman.
At 13:50 the back of the camera tent is visible to the right of the shot. (Source: DVD commentary)