Continuity: When Daphne jumps off the stairs to help the park owner her boots clearly change to trainers in mid flight and then back to boots when she lands.

Continuity: In the beginning of the movie during the skateboard scene with Shaggy and Scooby riding along the conveyor belt, Scooby grabs a hook and both Shaggy and Scooby jump off of the skateboard. You see the skateboard falling off the conveyor belt, but in the next scene it is on the conveyor belt and being crushed.

Continuity: At the end when Mary Jane grabs Scooby and Shaggy by the neck and holds them off their feet, she grabs Shaggy with her left hand, in the next shot it is her right hand holding Shaggy's neck (you can see her turqouise bracelet) then back to her left hand.

Deliberate "mistake": In the first scene Velma got sprayed by the hose and slips but gets her foot caught on the chain; hanging upside down, but her skirt doesn't go "up". Deliberate to maintain the "family movie" tone.

Revealing: In the scene where the monster that got into Daphne is being destroyed by sunlight, everything else in the room seems to have frozen for a second. Carefully look at Daphne.

Revealing: In the scene where Scooby, Shaggy, Mary Jane, and Daphne go crashing through the window while running from the two monsters, the falling glass and broken window frame pass right through the CGI Scooby.

Revealing: During the film, set lights and reflectors can been seen reflected in Daphne's sunglasses and Velma's glasses numerous times, especially in closeups.