These are the first, and only, appearances by Kelso's father and Hyde's mother. Kelso's brother, Casey (Luke Wilson), is the only member of his family seen elsewhere, including at Donna's bachelorette party, in a later episode.
First of three appearances by Hyde's mother (Katey Sagal), and the only one in which she is actually seen. In "Prom Night" and "Punk Chick", only her voice is heard, yelling at Hyde from inside their house.
At 12:43, Dr. Ashley (Steve Ireland) is wearing a name tag that reads K. Ashton, a reference to Ashton Kutcher (Kelso).
Nurse Philips was played by Linda Wallem, an executive producer of the show.
Fez says he wants to take the knowledge he's learned in Wisconsin back to his homeland and rule with an iron fist. At about 21:46, when Fez says "iron fist", Kelso is very subtly mouthing "iron fist" along with him.