The Courtship of Stewie's Father - S4-E16
Continuity mistake: When Peter takes the garden hose upstairs, the bathroom doorknob is on the right side. As Peter kicks in the door, but from inside the bathroom, the doorknob is on the opposite side of the door, so it swings open the opposite way. (00:10:25)
The Courtship of Stewie's Father - S4-E16
Continuity mistake: After Peter's mess of glee club, in the first shot of Obi-Wan the right side of his robe is over his left side, but next shot it's the opposite way with the left side over the right. (00:02:15)
Brian Goes Back to College - S4-E15
Continuity mistake: After painting the stripe on the van, the side passenger door handle vanishes when Peter/Hannibal gets into the front seat; then, that handle reappears when Quagmire/Face enters the van. (00:09:10)
Brian Goes Back to College - S4-E15
Continuity mistake: When Brian is escorted into the New Yorker's writers' lounge, the door has a knob and backplate, but the backplate vanishes in a following shot. (00:03:15)
Brian Goes Back to College - S4-E15
Continuity mistake: After the opening credits, Peter/Hannibal is wearing a jacket with pockets only on his right side; then pockets suddenly appear on his left side between shots. (00:00:40)
Continuity mistake: Lois' breasts grow in size when Peter is trying to get Quagmire to snap out of his trance.
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.
Other mistake: Peter says I can't afford to keep you. He puts 4 bullets in the shotgun. He shoots a total of 5 times.
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.
Jungle Love - S4-E13
Other mistake: In the kitchen when Peter is playing with the paddle ball and then Brian confesses to giving Chris the idea about joining the Peace Corp, there is a picture frame on the wall behind Peter. In this is various pictures of the family including Brian. In this, Brian is as a yellow dog despite being white in the series, and even in the scene depicted.
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)
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