Family Ties - S4-E17
Continuity mistake: The style of the lettering on Magda's gravestone changes after the goat-woman runs away from Magneto. There is also a stone that was next to the grave when it is first shown that has suddenly disappeared in the same shot of the goat-woman running away. (00:09:10 - 00:09:45)
Family Ties - S4-E17
Continuity mistake: Quicksilver's neck is colored the same light-blue hue as his uniform when he says "The mutant who did this..." (00:07:45)
Family Ties - S4-E17
Continuity mistake: When Scarlet Witch and Quicksilver first meet the High Evolutionary, Scarlet Witch's headgear alternates between being red and pink. (00:05:55)
Family Ties - S4-E17
Continuity mistake: When Bova is bringing the baby twins to Django and Marya's house, the arm she is carrying the respective twin in changes depending on the shot. When she is first shown walking towards the house, she is holding Wanda in her left arm and Pietro in her right. When she is walking up the steps to the door, she is carrying Pietro in her left arm and Wanda in her right. When the shot changes after Django opens the door, the twins have switched arms again, and then again when she hands the babies to Django and Marya. (00:02:30)
Continuity mistake: When Xavier is explaining to Wolverine the importance of vigilance, Beast can be seen directly behind him. When the shot changes, Beast is no longer standing behind Xavier. (00:18:25)
Continuity mistake: When Xavier is surrounded by a group of mutants in his subconscious, if you look at Quicksilver you can see that the colorist made his shirt flesh-colored. You can tell he is supposed to be wearing a shirt because the lightning bolt design is still going across his torso. (00:05:20)
Secrets, Not Long Buried - S4-E15
Continuity mistake: During the battle at the end, Cyclops uses the crystal statue he brought with him in the fight by throwing it into the air and uses it to refocus his optic blasts on a crowd of attackers. After the battle is over he gives the statue to Dr. Prescott without ever having retrieved it. (00:18:55 - 00:20:20)
Secrets, Not Long Buried - S4-E15
Continuity mistake: The mutants that have gathered for Solarr's speech are in different places throughout depending on the shot. (00:16:50 - 00:18:50)
Continuity mistake: When Gambit notices Cody on the monitor, the pink rectangular patches on his pants that are normally horizontal are now vertical. (00:10:30)
Continuity mistake: The Colony's Acanti ship goes from having its face buried into the walls of the chasm and its body above ground to having its body partially buried in the valley floor and its face free from the wall. (00:06:50 - 00:08:10)
Continuity mistake: Rogue's vanity has a teddy bear and a telephone on it. When Gambit comes into her room, the phone has disappeared. (00:03:55)
Continuity mistake: When Wolverine is being surrounded by the aliens, he is standing by a cactus plant. When the shot changes the cactus has disappeared. (00:03:15)
The Lotus and the Steel - S4-E13
Continuity mistake: Shoulder pads appear on Jubilee's coat at the end of the episode. (00:19:45)
The Lotus and the Steel - S4-E13
Continuity mistake: Wolverine tears off the red sun portion of the Silver Samurai's costume. Moments later it has reappeared. (00:19:30)
The Lotus and the Steel - S4-E13
Continuity mistake: When the biker discovers the children hiding in the tree, his motorcycle is parked right next to the tree with the left side of his motorcycle facing the pit. When he gets back on the motorcycle, it is suddenly several feet away from the tree and the front wheel is facing the pit. (00:16:30)
The Lotus and the Steel - S4-E13
Continuity mistake: The amount of fish that fall out the net is more than could have fit into it. (00:16:25)
The Lotus and the Steel - S4-E13
Continuity mistake: When the biker gang is raiding the village towards the end of the episode, the leader of the gang alternates between having two spikes on each shoulder of his jacket, having them only on the left shoulder, or having none at all. (00:15:55)
The Lotus and the Steel - S4-E13
Continuity mistake: The village elder Yoshida-san suddenly has sideburns and a goatee when Soichi is mocking Wolverine. He is clean-shaven for all other parts of the episode. (00:07:25)
Have Yourself a Morlock Little Christmas - S4-E12
Continuity mistake: Rogue's headband is flesh-colored when Beast says "It would appear that my face is not the world's most reassuring." (00:16:30)
Have Yourself a Morlock Little Christmas - S4-E12
Continuity mistake: When Leech is first shown in his sick bed, he is shirtless and under the sheets. When he begins receiving a blood transfusion from Wolverine, he is fully clothed and also wearing a beanie. Given the weak and near-death state he was in, it's extremely unlikely the other Morlocks would bother dressing him. (00:09:20 - 00:14:15)