When Two-Gun Urkel shoots the bottles on the bar shelf, you can see the holes in the wall, where the bottles where most likely broken away by people from behind the wall. When Sheriff Carl shoots the flames away on the candles, more holes can be seen on the wall, where the flames were blown out by air that was blown from the holes.
Eddie's birthday is revealed as January 28, 1974.
After Carl sinks the 9 ball, in a subsequent view the 9 ball is still on the table, then a few moments later it's back off the table.
In the episode "Torn Between Two Lovers" Eddie's girlfriend Jolene broke up with him, however in this episode they're dating again with no explanation.
When Eddie crashes the car through the wall, the camera angle goes a bit too high and you can see part of the soundstage behind the set of the front porch, trees and "sky".
In this episode, Eddie's full name is given as Edward James-Arthur Winslow, but in every episode after that his full name is mentioned, the James is mysteriously taken out.
Continuity: In this episode, we see Carl buying the ring and cassette from Steve but in season 9, we see that Steve is proposing to Laura and states that it is the same ring he kept all these years while playing the same cassette. How is this possible if Carl bought it from him?
Steve is supposed to be a genius so how does he not know that you don't throw water on a grease fire?
In the first scene at Leroy's place, Steve Urkel (a waiter) walks out carrying multiple plates of food in his arms and one plate of French fries in his mouth to the customers. Wouldn't carrying a plate of french fries in your mouth be a major health code violation?!