The Australian Man who Hermes forced to do all the work in Spa 5 is later seen as a Sphynx building slave in episode "A Pharaoh to Remember." His design is based on Paul Hogan as Crocodile Dundee. Number 9 once again appears in this episode
LaBarbara's line "Spa 5? Is it good?" is read not by her voice actress Dawnn Lewis, but by Tress MacNeille, who recorded the temp lines, presumably for the animatic. This is mentioned in the audio commentary for the episode.
When Hermes is attempting to sort the master pile, he is told that he has only four minutes. He musically completes the task in just over a minute and a half, assuming the song takes place in real-time. He is told that he finished 2 seconds early. But he really says you have until closing time to finish, not at closing time.