Plot hole: The history on Urkel's Isetta is all wrong; in one episode he mentions that he paid $4 for a sunroof that he claims he bought used, however his uncle paid him $50 to take it away. In another, he claims his car has a speedometer that goes up to 30, but before it had a chalkboard. In "Hot Rods to Heck," the speedometer goes to 60 mph. The car would also screech, putter, sputter, smoke, break down, etc. but it seemed to be just fine in "Driving Carl Crazy," ''It's Beginning to Look a Lot like Urkel," and "Hot Rods to Heck."

Family Matters (1989)
1 plot hole in show generally
Other mistake: In this episode, they have a leak in the roof. Yet, the house is a two story house with an attic. So it should not be able to leak into the living room. Also, when Carl and Eddie go up to fix the roof, Eddie falls through the roof and ends up on the living room couch. Again, two story house with attic. Should not happen.
Steve: Laura, this is a... A really special moment and... Well, I think we should celebrate it by... Getting married.
Laura: No.
Steve: Engaged?
Laura: No.
Steve: Going steady?
Laura: No.
Steve: A date?
Laura: No.
Steve: A kiss?
Laura: No.
Steve: A handshake?
Laura: No.
Steve: I'll see ya tomorrow?
Laura: Yeah.
Steve Urkel: I'll take it.
Trivia: When this show first went into syndication, a market in New England declined to pick it up, thinking it wouldn't be popular with their demographics. They ended up providing the show for free with the agreement that the market would end up paying for the broadcasting rights if the show reached a certain ratings threshold.
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.
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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.