Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Jean Grey is inspecting Bishop's gear, she isn't wearing any lipstick. A couple of shots later, she is suddenly wearing lipstick. (00:15:05)
Days of Future Past: Part 1 - S1-E11
Continuity mistake: When Wolverine is telling Bishop that he's not letting him out of his sight, the tubes on the back of his right hand are missing, and then are there in the next shot. (00:17:20)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit is telling Rogue that he'll park her car, the pink stripes that are normally on his pants are missing. (00:02:40)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit announces his arrival, he is standing just in front of the doorway. When he puts his hands up after Bishop draws his gun on him, there is now a wall behind him. (00:03:07)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Xavier is speculating if he is the one Gambit is supposed to assassinate, he is at Jubilee's 3 o'clock. When the shot changes, he is now at her 2 o'clock. (00:06:31)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Storm is saying "It is the only way to be certain," the pointed end of her right earing is briefly square-shaped. (00:07:53)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Cyclops is telling Gambit that they can't allow him to leave, he is standing behind Xavier's right shoulder. When the shot changes, Cyclops has disappeared. (00:07:53)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Bishop is shooting an energy blast at Gambit, he has three playing cards and five poker chips in front of him, while Wolverine also has three cards. When Wolverine is telling them both to sit down, Bishop now has four cards and eight chips, and Wolverine has four cards as well. Additionally, the deck has moved closer to the center of the table, and the arrangement of Wolverine's chips and the arrangement of Gambit's cards and chips have changed. (00:08:35)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Blob is looking out the hotel window, the window panes have been opened at a 90° angle. When the shot changes, the opened panes are no longer visible. When the shot changes again, the windows are slid open, which would make it impossible for the panes to have been positioned at a 90° angle in the first place. (00:09:07)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Mystique is warning the Brotherhood not to fail, the TV is off. When the shot changes, it is suddenly on, and the antenna is suddenly smaller. (00:09:16)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit hands Bishop the deck of cards to cut, Bishop places them at a diagonal angle in front of him. When the shot changes, the deck is now pointing straight. (00:09:36)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Avalanche and Pyro are attacking the chambers, Avalanche destroys a bookshelf that wasn't there at the beginning of the scene. (00:10:42 - 00:11:17)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit is jumping onto the tree branch, the first shot shows that he is jumping towards the right side of the tree. When the shot changes to him landing on the branch, it is suddenly on the left side of the tree. (00:12:00)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Blob first confronts the X-Men, there is a light post behind him. When Rogue has her hand stuck in his chest, the light post has disappeared. (00:12:17)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: After Blob knocks Cyclops to the ground, Jean helps him up, and the two of them are standing a step away from Blob. The shot changes to Blob pointing and laughing for roughly a second, and when the shot changes again, Cyclops and Jean have disappeared, with not enough time to have moved offscreen. (00:12:20)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Rogue punches the Blob, her arm is shown to be sinking into the middle of his chest. When the shot changes, her arm is suddenly in his stomach. (00:12:25)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Wolverine is running towards Blob from behind, he is in his direct path. When the shot changes to Wolverine jumping onto him, he emerges from the right side of the screen instead of from directly behind him. (00:13:29)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Wolverine has his hands draped around Blob's eyes and neck, the parts of his mask that are next to his cheeks are colored yellow, when they should be black. (00:13:33)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Mystique is leading Senator Kelly into the room to kill him, a window has appeared on the door after they enter. (00:15:40)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Senator Kelly is untying the bound woman, she is in a different part of the room than she was when Kelly and Mystique first entered (note her position relative to the bookshelves). (00:15:50 - 00:16:27)
Answer: It appears a number of factors led to its demise. It was originally intended to air for 65 episodes, but its popularity extended that. However, there were continual production quality problems, issues regarding whether the content was suitable enough for children, as well as financial considerations that finally led to it being ended.
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