Character mistake: When Estelle gives her guest speech about the Tuskegee airmen she shows a slideshow. There is a photo of an airplane that she incorrectly labels as "a single engine P-47." This is not correct. The plane in the photo is a P-39 Airacobra. (00:19:45)
Revealing mistake: Carl, Eddie, and Steve are out ice fishing. At one point Carl falls through the "ice" and you can clearly see that the "ice" is made of some sort of styrofoam. It looks like the stuff used for packaging. The snow looks just as fake.
Carl: Go home! Go home! Go home!
Steve: I don't have to take this. I'm going home.
Trivia: Jaleel White broke and permanently disfigured his right-hand pinky finger while filming this episode.
Question: In the mistakes section it mentions that Richie's mother, Rachel, and the Winslow's younger daughter, Judy, disappeared without a trace. Was there ever any explanation?
Answer: No. Call it "Chuck Cunningham Syndrome". A character is written off the show without any explanation at all.
Answer: She disappeared because Judy and Steve's actors, Jaimee Foxworth and Jaleel White, didn't get along with each other.
Answer: It is said that as Steve Urkel became a more popular character on the show, Judy became less important to the storylines, plus either her or her parents were demanding more money, causing her to be removed from the show entirely.