Other mistake: When showing "In Association with" in the English dub's credits, The Pokémon Company is misspelled as "The Pokeman Company." (01:15:37)
Other mistake: When the kids are standing on the balcony after escaping from the dungeon, the arena is shown in the distance. Jimmy asks Goddard to activate his binoscope to get a look at their parents in the arena. The problem is that the walls of the arena obscure the center where the parents are dancing, which means that Goddard wouldn't have been able to get a clear view without going to a higher level. (01:04:55)
Other mistake: When the dead couple is found in the toilet they don't have a single wound on their chest, despite having been stabbed with a 3 meters big claw.