Night of the Sentinels: Part 1 - S1-E1
Revealing mistake: When the Sentinel is landing on the sidewalk, you can see the sidewalk is destroyed a split-second before the Sentinel's feet touch the ground. (00:02:05)
Revealing mistake: When the lab workers are running out of the plant as Magneto is wondering what Xavier looks like after so long, you can see the man in the lab coat and hard hat jerks backwards as he is near the flames. (00:07:53)
Revealing mistake: When Wolverine, Storm, Rogue and Gambit are walking down the stairs to the subway station, you can see that they aren't actually descending the steps, but walking on thin air. (00:11:10)
Revealing mistake: When Gambit and Wolverine are pinned to the wall by Tar Baby, Gambit's face somehow gets between the tar and his right shoulder when he is saying "Sticky situation, mon ami." (00:12:01)
Revealing mistake: When Wolverine is skiing towards the land bridge, his whole body moves back several feet as the camera is panning right. (00:02:54)
Slave Island - S1-E7
Revealing mistake: When Gyrich walks forward to shake the Leader's hand, the ground beneath them is noticeably shaking, possibly indicating a composite shot. (00:10:35)
Slave Island - S1-E7
Revealing mistake: When Storm is saying "There will be thousands of them," her mouth briefly disappears from her face. (00:16:45)
Revealing mistake: When Warren's girlfriend is looking for him in his lab, she is startled by Cable who is hiding behind the door and slams it shut once she enters the room. When she is startled and looks back at Cable, the animation is not very fluid. As she is turning around to look at Cable, her "onion skin" form remains, making it look like there are two of her. (00:03:35)
Days of Future Past: Part 1 - S1-E11
Revealing mistake: When Bishop is stepping out of the alley, you can see that he actually appears out of thin air and proceeds to step out from the outer wall of the building on the right. (00:10:15)
Days of Future Past: Part 2 - S1-E12
Revealing mistake: When Gambit draws a card from his sleeve to use as a trap, the gloved part of his hand that is below the pocket is translucent. (00:09:28)
Revealing mistake: When Jubilee is saying "What's anybody waiting for," her arm passes through Wolverine's body. (00:10:40)
Revealing mistake: When Xavier is parachuting towards the ground, the stars in the sky are flickering on and off. (00:19:00)
'Til Death Do Us Part: Part 1 - S2-E1
Revealing mistake: When Morph, disguised as Storm, is walking into the kitchen to talk to Jubilee, he appears out of thin air. (00:15:37)
'Til Death Do Us Part: Part 1 - S2-E1
Revealing mistake: When Morph has sabotaged Beast's Danger Room session, the same shot of Beast running away from the projectile apparatus is used twice. (00:18:08)
'Til Death Do Us Part: Part 1 - S2-E1
Revealing mistake: After Morph laughs when the police have shot Storm out of the sky, there is a split-second flash of the establishing shot of the Veteran's Building Jubilee went to a little earlier in the episode. Note, this mistake may only occur on Disney+. (00:20:31)
'Til Death Do Us Part: Part 2 - S2-E2
Revealing mistake: In the second shot of Rogue and Beast standing outside the hospital, you can see they are floating about a foot above the sidewalk. (00:05:16)
Revealing mistake: When Morph is saying "You never were very bright," part of his shirt collar has been drawn on his chin. (00:07:20)
