Plot hole: When we see the Zenith Team playing softball, it's a scene taken from later in the movie. For one thing, Mr. Pibb is there, even though we don't meet him until the next scene. Second, they're in the room with the UFO, but we don't see that until later. Finally, Zoom's outfit is different than the last scene, but in the next scene he's wearing the same outfit.
Continuity mistake: In the scene where the Princess and Houdini are running up the Zoom, Zoom is eating oatmeal. At one point, oatmeal falls on his chin, then the camera goes to Princess and she says, "You don't look like a superhero." Then the camera goes back to Zoom, the oatmeal's gone, and he reaches for a napkin. If he had wiped it off while she was talking, Zoom would have the napkin in his hand still.