In the scene where the Mystery Team debate whether to take the murder case, Briana is missing from the background when the camera spins 360 degrees. In the next shot, she's back again. Similarly, when Kelly and Briana walk away later in the scene, the next shot shows the street they should be walking down, but they're already gone.
After Jason is shot, he leans against wood. When he gets up, there is no blood on the wood.
Near the end, just before Jason shuts off the warehouse lights, he runs out from the shelving and there is a cut and he runs out again.
In the beginning, when the team goes to the playground, Eric still has Boysenberry on his (left) finger when he is on a swing, but it is gone as he uses the trapeze rings, then it is back when it gets licked off.
After Kelly leaves for the wake, Jason picks up a cell phone and selects a number. But then it calls a different number.
Just after Jason hits Kelly with the broom, he goes into the kitchen and you can see the finger of a crew member in the lower left hand corner signal Kelly to give her next line, "Why are you here?"
(at around 13 mins) In the upper right corner, while the camera moves between the "little me" and "find this Leroy guy" conversations.