Continuity mistake: When the fat guys arrive at Peter's group, pay attention to the Asian guy in the first seat third row. After they open snacks he has switched seats with the other guy in the first seat second row. The guy he swapped seats with hair also changes color. (00:12:40)
Brian Goes Back to College - S4-E15
Continuity mistake: Brian stands outside of the gates of Brown University. The girl entering next to him has a backpack with a top flap that changes from brown to yellow and back. (00:08:05)
Petergeist - S4-E26
Continuity mistake: The table with the TV on in Peter and Lois' room is just a small table at the beginning of the episode when Stewie talks to the poltergeist. But as they speak to Stewie in the TV it's on a high up chest of drawers. (00:08:00 - 00:12:00)
Continuity mistake: On the tour bus, in one shot we see Meg wearing her outfit that she wore when she had her make-over. Then about 10 seconds later you see her in a different outfit altogether.
You May Now Kiss The...Uh...Guy Who Receives - S4-E25
Continuity mistake: When Peter drives his car in the field it is perfectly visible, but in the next couple of shots the car's gone, and so are the tire tracks.
Brian Goes Back to College - S4-E15
Continuity mistake: When Brian arrives at Brown, his bag strap is across his body. When the shot changes, it's just on one shoulder. (00:08:00)
Brian Goes Back to College - S4-E15
Continuity mistake: Louis' hand changes places on the newspaper at the start when talking to Brian. Note its position in relation to the column. (00:02:10)
The Cleveland-Loretta Quagmire - S4-E5
Continuity mistake: When everyone starts playing charades, Joe is acting out a character. He has black shoes on. The boat throws him overboard and when back on the boat his shoes are white.
Continuity mistake: Brian and Stewie see Meg enter Mayor West's motel room. She's wearing a purple dress. They follow them to a restaurant and Meg has her regular hat and outfit on.
Petergeist - S4-E26
Continuity mistake: Lois slaps the skull out of Peter's hand and it lands on top of the dirt pile. They both turn around to look at the house and the skull is nowhere in sight.
Continuity mistake: At the start of the episode there's no coffee table beside the couch. When Brian is trying to prove to Peter that he has gravitational pull because of his weight, there's now a table with a bowl of fruit and a book.
Petergeist - S4-E26
Continuity mistake: The filing cabinet that was beside the TV moves to the corner beside the desk.
Continuity mistake: At the start in class there are two people behind Meg who both have green tops. When the camera shows the class from the front one of the green tops has changed colour. (00:02:05)
Continuity mistake: Going up the ladder Lois has Stewie in her left arm. However, as she comes through the window he is in her right arm. (00:06:00)
Continuity mistake: When Joe lifts his steak to his mouth you can see a section cut out of the steak on the plate. When he shoots the plate, the steak is whole. (00:01:50)
Brian Goes Back to College - S4-E15
Continuity mistake: When Stewie runs in to film Brian after he got fired, Lois has her arms crossed. When we see it from the camera's POV, her arms are in completely differently positions. (00:07:10)
Brian Goes Back to College - S4-E15
Continuity mistake: At the start Stewie is sat in the middle of the middle cushion on the sofa. However, as Lois walks off he is now sat on the join of two cushions nearest Brian. (00:02:25)
Continuity mistake: When Meg tells her family she's a lesbian, Lois has food on her spoon. As Meg starts yelling about her friends liking her, Lois is holding a fork with no food on it. (00:11:40)
Continuity mistake: As the trio are singing at the end, the position of the 3 changes between instant cuts. (00:20:05)
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