Director Trademark: [John Landis] [SYNW] One of the cartoon characters says it near the end of the first TV showing.
When George Wendt's character is speaking to Matt Keeslar's character in the ER waiting room, there are a couple of pages for "Dr. Howard, Dr. Fine". This is a nod to the Three Stooges' short Men in Black (1934), which paged the Stooges with calls of "Dr. Howard, Dr. Fine, Dr. Howard".
The hospital was actually a set built in the high school where Harold looks for a "big sister".
In the hospital scene, when 'George Wendt' is waiting in the lobby. You can hear on the intercom "Calling Doctor Howard. Doctor Fine." It's a reference to The Three Stooges.