When Milas comes to visit Peter in his apartment, Peter lights a bong using water from his aquarium and accidentally puts a goldfish into the bong. When he says "Oh God, that little guys gonna think he's a shark", the bong is clear. When the scene cuts back it is filled with smoke.
Junior has his eyelids tattooed. We never see the tattoos again.
In one scene, Peter Gaulke takes a bong hit and clears the bong. In the next shot, the bong is filled with smoke.
In the RV, the face of Cooker's beer can changes direction between shots.
When Peter and Fred's teeth are knocked out on the hood of the Hispanic man's car, Fred's mustache falls off.
Right after the crew discovers the camp where their competitors were killed by pygmies, they walk past a lake, supposedly in Ecuador. A mallard duck is swimming around behind them. Mallards don't live in South America.