Felipe is shown being bitten by a snake as he is hiding from Sócrates behind a rock, despite him ignoring it. Snakes never attack if not provoked, only when they're nervous or when they're preying on an animal.
Felipe's snakebite doesn't look like a snakebite at all.
When the students attack Zenaido's saloon, one of them hits him with what looks like a porous rock. However when it strikes him it looks like it's sticky, despite the fact that rocks aren't sticky at all.