Other mistake: When Peter is dancing to his musical number on top of the table, his head continually shrinks until the end of the shot, where his head is around a third of what it was originally.
Continuity mistake: In the scene where Peter and Lois are "getting dressed", the candles in the background switch from having candle holders to not having candle holders.
Continuity mistake: When Lois goes to the bedroom, she opens the door and trips the wire across the door. The wire is strung across the bottom of the door but when she turns the light on, it has disappeared.
Other mistake: After Brian says Chris is tweaked and Chris says maybe the toad is Meg's, the bubbles in the aquarium stop moving.
Continuity mistake: After Peter laughs about Charles Dickens, he changes position between shots. (00:15:25)
Continuity mistake: Just after Meg is payed out for never having done 'toad', she changes position between shots. (00:12:15)
Continuity mistake: When Connie and her friends walk up to Peter (as Lando) graffitying, the black guy changes position between shots. (00:09:55)
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