Continuity mistake: Immediately after Hourglass heads through the ceiling at the Comic Convention, several people are seen convulsing in the scattering crowd. This scene was appropriate only for the alternate ending, in which Hourglass does not go through the roof and tries to steal the lifeforce of those within the convention (the ones convulsing).
Continuity mistake: When Rick is walking down the street after the funeral, he passes a silver Pontiac Grand Prix, which is parked behind a Toyota. The same scene with a different angle shows another black car is suddenly parked behind the Grand Prix, without enough time having elapsed for the car to be parked there. Also, the Grand Prix is initially offcenter of the middle of the intersection, but the shot with the third car shows the Grand Prix in the center of the T intersection.
Revealing mistake: When Rick's uncle shoots his black friend, you can closely see that he doesn't shoot him, he shoots the table. And if he did, why wasn't his hand bleeding?
Revealing mistake: When Rick is breakdancing on the wall, it is obvious that the person dancing is not Drake Bell, who played Rick. You don't even have to slow down or pause the movie. The double's skin is more pale, he looks older than Rick, and his hair is darker.