Continuity mistake: When Vince Vaughn's character gets busted for talking on the "job phone" (in the beginning), he hangs the cordless onto the receiver (wall-mounted). The next cut back to him shows no handset, only the receiver.
Suggested correction: When he hangs up the phone, it remains hung up on the wall receiver for the rest of the scene. The phone can be seen several times before the scene ends. The way you can tell is this: when the phone is off the receiver, there is a stripe of grey duct tape holding the receiver to the beam. The phone does not have any duct tape on it, so when it is hung up on the receiver, the duct tape is no longer fully visible, because the handset is covering it.