Continuity mistake: When Lois enters the kitchen while talking about needing the checkbook, her shoes aren't exposing her feet like they usually do.
Boys Do Cry - S5-E15
Revealing mistake: When Lois places Stewie on the floor whilst at the Little Miss Texas pageant, one of the girls is seen looking at herself in a mirror, only she doesn't seem to have a reflection. (00:15:35)
Continuity mistake: Peter states at one point he had no brother or sister and only had a bro-ster. But in the earlier episode "Mother Tucker", it was revealed Peter had a twin brother called Thaddeus Griffin.
Road to the Multiverse - S8-E1
Continuity mistake: At the fair, Stewie's genetically perfect pig has a red collar. But when we see them in Stewie's room, the pig's collar is black.
And Then There Were Fewer - S9-E1
Continuity mistake: When they notice Muriel has disappeared, everyone runs back up the secret passage. As they run out the room, the order of the guests are: Peter, Diane, Chris, Lois, Carl, Doctor Hartman, Meg, Jillian, Brian, Quagmire, Mort, Derek, Seamus and Mayor West is way at the back. Yet as they run through the passage the order is: Peter, Lois, Tom, Quagmire, Diane, Chris, etc. But as they come out of the passage, the order is: Peter, Lois, Tom, Diane, Chris, Bonnie, Meg, Quagmire, Carl, Mayor West, Doctor Hartman, Mort, Seamus and Jillian is way at the back and not Mayor West since he was last seen exiting the secret room. Also Derek nor Consuela were seen in the room just as they ran out, yet when they magically appear when they are doing the groups. (00:21:50)
And Then There Were Fewer - S9-E1
Continuity mistake: When James returns to the lounge to find everyone there, they all accuse him of killing Stephanie, so they walk over to the dining room with James at the front followed by Tom and Priscilla behind him and Joe and Doctor Hartman behind them. But when they enter the dining room, Tom and Priscilla are no where to be seen and it is now Joe who is behind him. Also in that same scene, several other characters change position. The people who are in the room are Peter, Chris, Brian, Quagmire, Joe, Bonnie, Diane, Doctor Hartman and Seamus and the rest of the guests aren't seen. So when they enter, Diane and Chris are at the back followed by Seamus, Quagmire and Bonnie in front of them, followed by Doctor Hartman, Peter and Joe at the front. There is then a shot of the chair completely empty. Yet in the next shot, Brian has suddenly appeared next to Joe out of nowhere. Then in the following shot, Diane is still at the back but now more closer to Bonnie and both Bonnie and Quagmire have changed positions and Seamus is now at the back and Chris is suddenly next to Quagmire at the edge of the right hand side of the screen and Peter is now behind Joe. Then the shot cuts to James and the shot cuts back to guests. But now Peter has appeared next to Doctor Hartman again and now in front of Joe and not behind him. Also Diane is now no longer at the back but in the middle towards the left of screen and no where Bonnie and Seamus is now partially in front Bonnie. Then when the shot cuts to James saying he is a member of MENSA and a huge hit with the ladies, there is no sign of Brian standing next to Joe. Then in the shot before the lights go out, Diane is now at least ten inches behind Bonnie and Lois has appeared behind Seamus out of nowhere. Then by the time the lights go back on again, Lois is now in front of Joe and all the other guests have appeared in the dining room. Then when Seamus says "Look", there's no one in front of him even though loads of other people were there in front of him before the lights went out. Then the shot zooms out and we can see in the shot are Doctor Hartman, Priscilla, Joe, Brian, Carl, Mort and Tom. Then when Joe says "Nobody touch the knife", it's now Seamus, Bonnie, Quagmire, Lois and Derek in the shot. Then when we see Peter and Chris in the shot, the shot zooms were Joe appears we can see Quagmire, Lois and Bonnie behind Peter even though they were way in front of them a couple of seconds ago. No way could they have all moved that fast, not with all the other people in the way. (00:13:40)
Continuity mistake: Near the end of the episode, Joe and Quagmire are shown sitting at a booth inside the bar with Joe pulled up to the corner of the booth. As Peter apologizes to them, Joe is no longer seen next to him. As Peter takes Quagmire's check, a part of Joe is seen sitting in the next booth. In the shot after, he disappears again for the rest of the scene.
Three Kings - S7-E15
Factual error: Stewie shoots Joe with a double barrel gun. He shoots at him 3 times without reloading. (00:12:50)
Factual error: When Stewie writes in his notebook he actually never opens it.
I Am Peter, Hear Me Roar - S2-E8
Continuity mistake: Peter complains about having to spend a week at a women's retreat for sensitivity training, but when he returns, the caption reads "two weeks later."
Continuity mistake: When Stewie mentions to Brian about his "Life's a beach" mug, the squares on his calender keep changing size.
Mr. Griffin Goes to Washington - S3-E3
Factual error: Neither the Lincoln Memorial nor the Washington Monument are visible from the East Front of the Capitol. Furthermore, the Lincoln Memorial is shown as being northeast of the Capitol, when in fact it is due west.
Continuity mistake: When Brian is at the psychiatrist's for the first time, the psychiatrist's chair changes position between shots. (00:08:20)
Continuity mistake: When Connie and her friends walk up to Peter (as Lando) graffitying, the black guy changes position between shots. (00:09:55)
Continuity mistake: After Lois says that Stewie is the 'president of poopy' she and Tricia change position in relation to the couch. (00:09:30)
Factual error: Peter is posing as a blow up sex doll. The tester picks him up like he doesn't weigh anything. Not possible.
Continuity mistake: Peter falls from the roof of the Clam landing on Joan Cusack. He puts her body in a mailbox that appears just for this scene.
Road to the Multiverse - S8-E1
Other mistake: In every universe - except for the double-headed universe - Brian and Stewie travel to, they (seem to) replace the version of themselves that universe already has of them, but then in the Dog universe they have a separate version of themselves that they continuously interact with.
Ocean's Three and a Half - S7-E7
Factual error: Bonnie changes Susie and Joes diaper. There's no way Joe wears the same size diaper as Susie.
Boys Do Cry - S5-E15
Other mistake: Towards the very end, they automatically head to the car, planning to leave Texas, without any of their items from the house packed in the car after running away from the mob at the Miss Pageant Contest.
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