Revealing mistake: When Gambit bumps the toggle switch that increases the Danger Room difficulty, you can see it actually moves itself before his elbow touches it. (00:02:55)
Revealing mistake: When the assassin is handing Bobby the tithe box, the assassin's left hand passes through the chair Bobby was sitting in. (00:11:15)
Revealing mistake: When Bella Donna is preparing to shoot a blast of energy at Rogue, her body passes through the left hand of the man on her left that was holding her back. Half of her cloak then disappears as she strides forward. (00:14:42)
Time Fugitives: Part 1 - S2-E7
Revealing mistake: When the electronics store manager collapses onto the display stand, if you look closely, you can see the business cards he falls onto fly into the air before his head makes contact with the stand. (00:08:23)
Time Fugitives: Part 1 - S2-E7
Revealing mistake: When Wolverine is free falling from the Blackbird, his left leg passes through Cyclops' right arm. (00:11:40)
Revealing mistake: When Beast is entering Carly's room to see if her procedure was a success, he passes through the door frame. (00:11:08)
Mojovision - S2-E11
Revealing mistake: When Mojo's studio audience is cheering after he says "I give it two flippers up," you can tell by each character's celebratory movements that it is just a reverse of the shot where the audience was first shown earlier in the episode. (00:07:50 - 00:15:23)
Mojovision - S2-E11
Revealing mistake: When the Gladiator robot shoots an optic blast at Wolverine, you can see the hole in the chest area of Wolverine's uniform is already there before the blast hits him. (00:16:24)
Mojovision - S2-E11
Revealing mistake: When Jean is dodging the Punisher robot's gunfire, the edge of an animation cel is visible, most noticeable when she is starting to form a telekinetic bubble around herself. (00:16:38)
Mojovision - S2-E11
Revealing mistake: When the X-Men are being returned to the electronics store, there is a noticeable jump-cut (odd for a cartoon) just before Wolverine materializes. (00:18:40)
Mojovision - S2-E11
Revealing mistake: When Sauron is first shown flying towards Shanna, the edge of an animation cel is briefly visible on the right side of the shot, going over a jungle fern. (00:19:54)
Revealing mistake: When Wolverine notices Slab running off with Jean Grey, you can see the edge the animation cel moving across the screen from left to right. (00:12:34)
Revealing mistake: When Beast states that it appears safe to enter the alien ship, his right arm and right leg completely pass through Professor X's body and hover-chair respectively. (00:13:45)
The Phoenix Saga (1): Sacrifice - S3-E3
Revealing mistake: During the opening battle in outer space, when the green ship uses its tail to tear a hole into the larger ship, you can see the tear slightly shift downward. (00:01:47)
The Phoenix Saga (1): Sacrifice - S3-E3
Revealing mistake: After the X-Men rescue Dr. Corbeau and retreat back to the shuttle, they come upon a room with crew members passed out on the floor. Keep an eye on Wolverine in the background on the right side of the screen and you will see him literally walk through a door panel. (00:17:28)
The Phoenix Saga (1): Sacrifice - S3-E3
Revealing mistake: When Cyclops is saying "Can this thing still fly," the purple coloring of the buttons behind him on the left shift up, while their black outline remains in place. (00:17:59)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Revealing mistake: When Jean is saying that she feels strange, the edge of an animation cel is visible moving left and right under her pillow. (00:05:27)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Revealing mistake: When Lilandra is saying to Xavier "I have seen your face a thousand times in my mind," the edge of an animation cel is visible around the parietal area of Xavier's head. (00:20:24)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Revealing mistake: When Professor X is telling Juggernaut that he is in his mind, if you look closely you can see there is a disembodied mouth on the right side of Professor X's face that is synchronized with his dialogue. Apparently an animation error. Note: this error may only apply to the DVD version of the episode, as it does not occur on the version of the episode that appears on Disney+. (00:04:00)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Revealing mistake: When Wolverine is trying to break out of the crystal entrapment, a yellow box appears on screen for a few frames that says "Cut out these frames." (00:15:58)
