The scene in which Mackintosh enters the funeral, takes a pin from his lapel, and stabs Casey in the hand to see if he's really dead, echoes a similar scene in Charade (which is also about three ex-soldiers trying to get their hands on a bunch of gold bars that they attempted to steal years earlier).
When the vault of gold bricks is opened, Chuck exclaims, "Holy Goldfinger!"
Morgan puts a Stormtrooper helmet on Casey.
Morgan has a Boba Fett helmet.
Casey tells Sarah and Chuck that his team escaped then Chuck goes into the A-Team intro.
While delivering a eulogy for Casey, Morgan quotes a line from one of the songs from An American Tail.
After Jeff and Lester rescue Casey from the dumpster they put him in the backseat of their car. Casey is paralyzed and wearing sunglasses, reminiscent of scenes in Weekend at Bernie's where Bernie, dead, is propped up wearing sunglasses.
When T.I. finds Casey's mailbox the one next to it is "Bauer". Jack Bauer main character in "24" where he serves as a counter terrorist agent.
Morgan tells Alex that he had a "Halo" tournament the previous night.