Continuity mistake: In the scene where Charlie and the snowman (his dad) are getting chased by the bullies, the sled gets split in half into two sled pieces. But you can clearly see that in some parts of this scene, Charlie is riding a real snowboard, and in others he is riding the half piece of sled.
Continuity mistake: In the scene where Richie is running away from the gaurds he dives over the platform and knocks over the statue with his foot, but when the other gaurds go to jump over it, the statue reapears.
Continuity mistake: Jake is opening Ian's locker, with Ian inside. He asks the third number of the combination; depending on the shot, he's holding the lock with both hands, or he has one hand on the door itself. (00:03:10)