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.
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.