Continuity mistake: When Ulysses S. "Griffin" is chugging beer with Robert E. Lee, Ulysses wins. When he says "How's that Robert E. Lee," he puts the beer glass on his head. After Robert says, "Okay no more slaves, but we still don't have to read books," the glass is in Ulysses' hand. In the next shot it's on his head again. (00:10:05)
Continuity mistake: After Mayor West enjoys eating the taffy, when it cuts to the Griffin family standing on their lawn, the post-mounted mailbox is placed on the right side of the front door's walkway, but then it switches to the left side of the walkway.
Continuity mistake: While Peter is with Mayor West at Town Hall, when Peter winds up in the trap door, the doorknob on West's office door changes sides (so the door opens the opposite way) and the plant moves away from the corner.
Continuity mistake: In the first shot of the pool party, Peter's "President" sash is draped from his left shoulder with the visible letters "n" and "t" in reversed positions. In the following shots the sash is draped correctly from Peter's right shoulder.
Continuity mistake: Just before Adam West opens the trapdoor under Peter, Peter moves further away from the deck between shots. (00:07:20)
Continuity mistake: In the very first scene, the background that Peter and Brian are walking past changes. (00:00:30)
Continuity mistake: When Joe jumps off the trampoline, the trampoline is a lot smaller than when it was before. (00:00:50)
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