Continuity mistake: Stan hears Francine's parents at the door, and Klaus is in front of him with a bowl of nachos to the left of Klaus. In a few shots, Klaus's bowl and the nachos switch spots.
Continuity mistake: Steve receives a Rowflux and five containers of protein powder. He takes one of the containers leaving only four still on the floor. In a subsequent scene, Steve is still holding the container but now five containers can be seen behind him, giving him six containers altogether.
Cock of the Sleepwalk - S9-E11
Continuity mistake: After Stan says "Fired?!" and the camera goes back to Bullock, the word IHOP appears on the board behind them. (00:13:45)
Chosen answer: It is just the decision of the creators to do so.
MasterOfAll