Continuity mistake: Fluttershy's neck disappears after she says, "I don't know if I can cheer enough to help her".
Space Monkey - S1-E1
Continuity mistake: In shots of the Houston officer in the Space Monkey clip, the wall from behind the Space Monkey is blue, but in shots of the monkey, the wall is grey. (00:12:30)
Continuity mistake: When Sylvester enters his mother's house, he slides the glass door from the wall to the middle and right to left (from viewer's perspective). But when he closes it, he closes it from right to left so it closes in the middle, even though it wasn't set up that way.