Revealing mistake: In the overhead view of the bus driving across the desert to Camp Greenlake the dust behind the bus is CG, and near the end of the scene the bus moves up in the frame and the end of the dust trail cuts off with a straight line.
Continuity mistake: The cast even points this out on the commentary: At the camp, where the tents and cabins are, there are trees at times and sometimes there aren't.
Continuity mistake: Trout Walker has a gold tooth. In the scenes where he is wealthy it is on the left side of his mouth. In the scene where he is poor and dusty, pointing a gun at Kate, it on the right side of his mouth.
Continuity mistake: When Stanley finds the lipstick tube of K.B., X-Ray takes the tube then Stanley stops him. We see two angles (in front and behind) and Squid keeps changing his spot from left to right every time we see a new angle.
Deliberate mistake: When Kate Barlow shoots the Sheriff, she shoots him between the eyes, but when she kisses him there is no hole or anything on his face.
Continuity mistake: At the end part, when the kids at Camp Green Lake go dance in the rain, we see Zero looking up and his hair is in the air. In a different camera angle, his hair is put down by the rain. But when the camera returns to him looking up, his hair is up again.
Continuity mistake: When Stanley drives up in the bus, he sees Sam, and he fades away. At the same time, the bus window frame fades in, too.
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.
Audio problem: When Mr. Pendanski is saying, "Smells like puke from a mule." if you look carefully he is actually saying, "Smells like piss from a mule." Original dialog is in the 'Deleted Scenes' section of the DVD.
Continuity mistake: At the beginning when Stanley is digging his first hole, he has gloves in some shots and doesn't in others. (Specifically when he's complaining about the other guys' dirt).
Visible crew/equipment: In the part when Stanley and Zero are climbing God's thumb and Stanley is about to slip look closely and you can see the harness on Shia.
Continuity mistake: In the scene at the end where the Yeltnats open the chest you can see Stanley's father with rubber gloves on, he takes his left glove off to look at the stock papers. You see him with his right glove on still, then Stanley takes one of the papers from his father and he doesn't have any gloves on, and in the next shot he has it back on his right hand.
Continuity mistake: In the scene when Zero and Stanley get to the top of God's Thumb Mountain, Stanley splashes Zero with some of the muddy water. Zero goes from having no mud on him, then having mud on him (before even getting in the water), to only having mud on his back (before getting in the water), to having mud on him (after in the water), to finally having no more mud on him (after being in the water).
Continuity mistake: When Stanley is getting into the orange suit when he first arrives, he buttons a button, then falls. Then he finishes buttoning his suit and goes outside with "Mom". When he's outside some of the buttons are unbuttoned.
Continuity mistake: When the boys were saying nobody messes with the Caveman, you see from behind X-Ray that both Magnet and X-Ray have their elbows on the pool table, but in the next shot X-Ray has his hands on the table and Magnet is going to put his elbows on the pool table.
Continuity mistake: When Stanley first asked Armpit where to get water, Armpit throws him to the ground and the boys crowd over Armpit's shoulder in the close up. But from behind we see that the boys are more spread out.
Other mistake: When Sam is selling his onions, he asks an old man to take his hat off so he can see if he's bald so he'll know if he needs to sell him some hair growing tonic. The old man is just barely taking off his hat and before Sam can even tell the old man has no hair, Sam says "Mm hm, just as I thought."
Deliberate mistake: In at least two different scenes, there are time-lapse shots of the stars moving across the sky above a horizon. Given that the location is Texas, they rotate in the wrong direction. If the horizon is southern, the stars should rotate left to right, not right to left. If the horizon is northern, they would rotate counterclockwise around a fixed point *above* the horizon, i.e. the North Pole (celestial), where the North Star would be.
Continuity mistake: When the Warden says to Stanley, "I still expect 7 holes." Stanley has his hat off, but in the next shot his hat is on again.
Answer: He's eating a candy 'fruit' wedge. I remember him holding them when Stanley is first shown into his tent so I assume that he confiscated them from Stanley.