You might notice a strange creature prancing around the tarmac when Evelyn's station wagon arrives at the Emerald City airport. This is the same Ozzopotamus West brings to life with Ozonium in Chapter 1 of Lost In Oz, entitled "Go Forth."
Smith accuses Tinker of having sold their clockwork man to an evil queen. Perhaps they were inspired by Tik-Tok, a wind-up man once owned by an evil king known as Evoldo. You can read more about Tik-Tok in L. Frank Baum's book "Ozma of Oz."