Yug Ylimaf - S11-E4
Deliberate mistake: The time machine reverting causes everything in life to go backwards. However, although the characters' acts are reversed, their lines always sound normal. (00:08:00)
Space Cadet - S11-E9
Revealing mistake: When Chris is giving them a tour of the shuttle, they are standing up normal. When they take off, they are still standing straight up. The shuttle goes straight up. You would be on your back at take off. They would never be able to stand straight up.
Yug Ylimaf - S11-E4
Other mistake: Everything goes backwards in time and goes that far back that Meg (who is voiced by Mila Kunis) goes back to being voiced by Lacey Chabert (who voiced Meg in season 1). However, when Lacey Chabert does her line to Stewie being in the Griffin house for the first time, it goes back to Mila Kunis when Stewie is "reborn". However, if everything was going backwards and Brian fixed everything to make it goes forwards again, then it still should have been Lacey Chabert voicing Meg, not Mila Kunis. (00:16:30 - 00:19:35)
Continuity mistake: When Peter and the family reach the top of Mt Everest, it shows a long shot of them all by themselves. Cut to Lois talking - another family is suddenly sitting there, and the woman says "we beat you by one hour and 11 minutes."
Yug Ylimaf - S11-E4
Factual error: Near the end when Stewie is being put back and out of Lois's womb, he has no umbilical cord attached to him.
Yug Ylimaf - S11-E4
Continuity mistake: When Stewie is born whilst time is reverting, Doctor Hartman says "It's a girl... with a penis and no vagina". Then after Brian restored the flow of time and Stewie is actually born, Doctor Hartman instead says "It's a boy". (00:18:25 - 00:19:55)
Continuity mistake: Peter rescues the Fishmans. When the family pulls him up he's holding both of them under one arm and has a huge rock that came from nowhere under the other arm.
Yug Ylimaf - S11-E4
Continuity mistake: In reversed time, we see Cleveland falling back to the inside of his house that had just been wrecked by Peter who launched himself with a cannon into it. The camera zooms in on Cleveland as he falls back to the inside of his house, only for Peter to suddenly be visible along with an additional piece of the roof taken away, after the area in which Peter would appear on and the roof-piece disappear at was off-camera for a few seconds.
Farmer Guy - S11-E20
Continuity mistake: When Brian enters the farm house, Meg is on the floor unconscious on her back with her face up, but the next shot when the rest of the Griffins enter, Meg's head is turned to her left.
Friends Without Benefits - S11-E7
Continuity mistake: When Meg is at the movie theater with her date, she starts sweating and changes her shirt to a clean one she gets out of her purse. When they get back home, Meg no longer has her purse.
Lois Comes Out of Her Shell - S11-E6
Other mistake: When Lois goes to Justin Bieber's dressing room, when she enters the room and Justin looks at her reflection in the mirror you can see her arm disconnect from her body as she talks to him.
Other mistake: Peter is in the hospital and Lois is there talking to him. There are 2 IV bags and a heart monitor next to his bed. The monitor shows his heart beating normally yet there aren't any wires hooked up to him.
Other mistake: When Peter was rescuing the Fishmans he totally missed grabbing the woman's hand but she didn't fall.
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