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)
Episode #4.2 - S4-E2
Continuity mistake: When Ben is serving the puree/meal he created, firstly he removes the lid from the serving dish with his left hand. It then reappears in his right hand. Also the ladle Ben is holding to serve his concoction switches hands for the next three shots.
Chosen answer: Angels and Demons.