Continuity mistake: While Sam puts Slappy on the junk cart the sun changes between shots.
Continuity mistake: Towards the end after all the monsters are gone, in the background the sun is barely shining, but after 5 or 6 minutes when Sarah and the others are outside the building it's completely daytime.
Other mistake: After Sarah gets Slappy into the locker he could see Tyler from inside but the problem is that the angle and the height of the vents are wrong for that perspective.
Continuity mistake: As Sam practises his school project in his room, Slappy's head changes position depending on the cut.
Continuity mistake: Slappy makes the Street Fighters action figures fight. The colors on the Rubik's cube change.
