Norman's ponytail was cut off during Pandora's Box. Even though it took him "a long time to grow that hair," his ponytail has regenerated by the time we see him in this episode.
Max's shirt gets stained by dragon's blood and is still stained by it in several following shots, but the blood is gone when they make it to the beach.
Virgil's means of summoning: A message from Virgil telling Max to take the portal at the bandstand in the town park cuts in on a tape Max is listening to on his walkman.
Educational epilogue: Komodo dragons.