A living hammer is seen repairing the door to the Silver Wand club. Hammer-Heads originate from a village in Quadling Country, and use their spring-like necks to headbutt any intruders to their village.
In this episode, Langwidere steals West's confidence from her. Ojo mentions that in Oz, people's personal traits can go missing, not unlike his hero, the actor and comic book icon the Tin Man who needed to visit the Wizard to get a heart. You can read more about his adventures in L. Frank Baum's The Wonderful Wizard of Oz.
West and Ojo's teacher is Professor Wogglebug. He is inspired by a character from a Baum's books, who was a very well-educated insect creature that was highly magnified until he was the size of a person. You can read more about him in The Marvelous Land of Oz.