Hamlin and Elena say goodbye to his groupies in full sun, but they are in shadow during the close-ups. In the subsequent wide shot, where Hamlin grabs Elena's arm, they are in the sun again.
In the episode "Pied Piper", Hamlin Rule raises his left hand to his head. In the next shot, his right hand is raised instead.
Wonder Woman states that the original Pied Piper led the children to safety. In the original story, he led them away, never to be seen again. Actually, that is only one version, and no one knows what the original tale was. There are other versions that state that the Pied Piper led the children out of the town of Hamelin as hostages, until he was paid for piping all the rats from the town. In another version, it was to save them from the plague. Therefore, what Wonder Woman states can be considered true, based on that version.