Continuity mistake: When we first see Kate and her parents at the restaurant there are only 2 empty chairs. Stewie then sits in the chair next to Kate. After Kate's parents ask what happened, we see a chair in between Stewie and Kate, but you can also see the edge of third empty chair. A plate and the wine filled glass also move.
Factual error: A TV announcer says "We now return to True Blood", indicating a return from a commercial break. True Blood airs on HBO, which is a premium network that does not show commercials.
Continuity mistake: When Brian is with Stewie asking for help, we see a set of blocks on the table, including a set of 3 stacked up. In the next shot, the 3 blocks vanish.
Answer: Mort is Jewish, and Walt Disney was said to be antisemitic. So it would make sense in a Disney universe all the inhabitants would share his supposed beliefs.
MasterOfAll