
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 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 Professor X, Cyclops and Jean Grey enter the room where Senator Kelly was abducted, Cyclops goes over to inspect the hole in the wall and Professor X states that his watch has stopped working. Cyclops, still on the other side of the room, asks why that's important. When Professor X drops his watch and it clings to his hover-chair to demonstrate that it's been magnetized, Cyclops is suddenly behind Professor X. (00:20:30)

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 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 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: The final scene from the previous episode is reprised in the beginning of this episode, yet some of the dialogue is different or omitted altogether. In Part 1, when Storm says "We all have dark sides to our souls," Wolverine responds by telling her to speak for herself and states he's more suspicious of Bishop than anybody. Also, when Rogue walks in and asks who Bishop is, before anyone can tell her, Gambit announces his arrival. When Bishop accuses Gambit of being the traitor, Gambit tells him he thinks there's been a mistake. In this episode, Wolverine never states that he is suspicious of Bishop, Professor X tells Rogue who Bishop is before Gambit walks in, and when Bishop accuses Gambit of being the traitor, he fires his gun at him before Gambit can even say anything.
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.
raywest ★