After Hook Foot gets stuck on the high jump hurdle, we see a "Sharp Teeth" placard being removed from the tournament leaderboard, as the standings have changed after that event. The problem is that a few minutes earlier we saw the entire leaderboard and there was no contestant named Sharp Teeth listed on it.
After Rapunzel completes the Gauntlet event, Skullkicker is seen tattooing her name on his right tricep. That tattoo disappears during the rest of the episode and only appears again at the end, when he tattoos Cassandra's name on his left tricep.