A Picture Is Worth 1,000 Bucks - S2-E11
Audio problem: When Peter comes out of the bathroom with wet hands and goes to dry them, the sound of the dryer is heard before he touches the button.
Continuity mistake: Peter gives Chris a carton of cigarettes and lights one for him to smoke. Camera cuts to Lois, then back to Chris and the cigarette in Chris's mouth and the carton on his lap are nowhere in sight.
Continuity mistake: The gun in Peter's first cutaway vanishes when the stage goes dark.
Continuity mistake: One of the ping pong balls that fall off Peter vanishes when it hits the ground.
Stu & Stewie's Excellent Adventure - S4-E30
Continuity mistake: At the end of the previous episode, Stewie gets on a cable car and sits next to older Stewie and they are facing out of the car. However, at the start of this episode, the seat they are sitting on is facing forwards.
Continuity mistake: When Carter destroys the bench after being the first contestant out of wining the old dirt bike, in the digger he backs off screen and you hear a crash and a car alarm, but when the shot is widened you see two cars where he backed into and both are undamaged.
Road to the North Pole - S9-E7
Continuity mistake: Before the start of 'Christmas Time is Killing us', Brian and Stewie hold each other. However, in the very next shot, they are standing normally.
Road to the North Pole - S9-E7
Continuity mistake: In the robot scene, 'Brian' is holding up a document. When 'Robert' says "Well, it's true", it cuts to a close up of Brian and the document has disappeared.
Road to the North Pole - S9-E7
Continuity mistake: At Santa's Village, the roller coaster in the background changes location and track layout.
Screams of Silence: The Story of Brenda Q - S10-E3
Continuity mistake: When Peter and Joe find Quagmire hanging from the ceiling, he has 2 black eyes. Minutes later in the hospital, they look normal.
Barely Legal - S5-E8
Revealing mistake: Every time Cleveland's tub slides out of the house, there's never any plumbing attached to it. It just sits on top of the floor so it slides out easily. In this episode its very easy to see.
The Hand That Rocks the Wheelchair - S9-E12
Continuity mistake: Meg drops Joe's gun into Bonnie's bag at the airport, but it's zipped closed - you hear the baggage check guy unzip it before looking in it.
One If By Clam, Two If By Sea - S3-E4
Continuity mistake: When Peter, Joe, Cleveland and Quagmire are in jail, Peter is the only one of them with a inmate number on his outfit. It's the same with the other inmates. Some have numbers and some don't.
Continuity mistake: Chris puts a video recorder in his room to try to capture the angry monkey in his closet to show Peter and Lois. He views the tape the next day and sees Peter and Quagmire enter his room. Quagmire punches Chris in the eye and bruises, it but when we see Chris the very next day, there's no black eye.
Audio problem: At the piano competition you see Peter playing towards the left side of the piano and hear the pitch going higher. This wrong because the keys for the high pitches are on the right side of the piano.
A Picture Is Worth 1,000 Bucks - S2-E11
Continuity mistake: In one shot of the Griffins at the hotel, Brian's collar is yellow instead of red.
I Am Peter, Hear Me Roar - S2-E8
Continuity mistake: During Lois' fight with Gloria Ironbox, Peter is wearing his usual white shirt and not his suit for one shot, then goes back to wearing his suit. (00:20:40 - 00:21:10)
Continuity mistake: Lois is wearing a green dress when peter is looking at her from the stage, but she's wearing a blue dress throughout the scene.
Continuity mistake: After the "Lint" scene, Meg's glasses disappear.
Revealing mistake: Einstein's eyes briefly pop out of his head during the Theory of Relativity scene.
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