Continuity mistake: When Zero and Stanley are going to God's Thumb, they try going up the higher part of the cliff. Right after Stanley is near falling, it shows Zero placing his shovel to his side in pain from his cuts. In the next shot, he pushes it away again.
Continuity mistake: In the scene where Caveman and Zero found dirty water on the mountain, you see them splash around in it, but the next morning, in another scene, their suits are just dirty at certain spots. (01:26:50 - 01:29:00)
Continuity mistake: When Stanley is calling for Zero, the flap on the back of his hat keeps changing when the angles change.
Continuity mistake: When Zero starts running away the warden we see from behind carrying her arms low. She says "don't shoot" then there is a shot of her front and she has her hands on her hips.
Continuity mistake: When Stanley first goes into the Warden's cabin there's a short shot of him looking up and analyzing the place with his hair a little messy and sticking up. Next shot his hair's neater.
Continuity mistake: In the scene when Armpit is doing his little break dance and lifts up his arms, Squid keeps appearing in and out of shots.
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.