Continuity mistake: In the scene where Madame Zeroni is explaining to Elya Yelnats about the curse that will be bestowed upon him if he doesn't carry her up the mountain after presenting the pig to Myra's father, her blouse is a blue button-up with gold stripes and no collar. Then the camera looks at Elya, and then back at Madame Zeroni. When it looks back at Madame Zeroni, you can see that her blouse is now a gold button-up with a collar.
Continuity mistake: When Mr. Sir gets angry at the boy who said, "What happened to your face?" he asks the campers if he looks good and you see D-Tent sitting in the upper left hand corner, everyone is sitting down. In the close up of D-Tent, X-Ray and Armpit are standing then. In the next shot with Mr. Sir, you see Armpit and X-Ray going to sit down. Then back to Mr. Sir, you see X-Ray standing. (01:01:05)
Continuity mistake: In the scene where Stanley and Zero are digging to find the chest toward the end of the movie, the background behind them is just a dirt wall. In a following shot upon discovering the box, there are stairs that lead to the hole. In the next shot, these stairs are gone again and it's just the hole again. (01:38:05)
Continuity mistake: When Mr. Pedanski is explaining Camp Green Lake to Stanley, X-Ray, Armpit, and Squid come. Then right before X-Ray says, "Go ahead Pit" there is a shot with Mr. Pedanski and Stanley and there are two boys walking together. Then when we see Stanley and Mr. Pedanski again they're gone only for one boy.
Continuity mistake: When Sam is being chased out into the lake there is some sort of ball right beside his boat when he gets shot, but when they shoot him the ball has disappeared.