Episode #4.6 - S4-E6
Continuity mistake: When Pete asks the man if they can have it in writing as they are having a family dinner, the kitchen door is closed, then the shot goes back to the man they are talking to at the front door, in the next shot which returns to Sue and Pete in the space of less than 2 seconds the kitchen door has been opened. (00:01:10)
Chosen answer: Angels and Demons.