In the scene which Myra and Steve are playing accordions, at one point you can hear the tape starting off camera.
When Max, Laura, Steve, Eddie, and Waldo are having their five-way phone conversation, Eddie tells Waldo to pick Maxine up at seven, but no one tells Maxine what time to be ready.
Judy Winslow makes her final appearance in this episode.
When Steve moves toward Laura and the gigantic Valentine's box of chocolates tips over on him, you can tell it wasn't on purpose. Jaleel keeps in character quite well, but you can see Kellie start to laugh. They cut to a different angle and she looks surprised, as if they cut and decided to use it.
When Laura is going to the library, she takes her multi-colored jacket from a hook on the back of the door. When Carl comes into the room to talk to Laura (which is actual Steve covered up in the bed), the jacket is still hanging on the back of the door. When he catches Laura sneaking back into the room, she has the jacket on and it is missing from the back of the door again.
Eddie and Steve lower the window shades before going to bed. When Carl arrives, the shades are back up.
We learn Weasel's full real name is Alex Parks.
When Eddie and Steve sign the paper, the landlord leaves without giving either one of them a key to the apartment.
When Tommy's mother brings in Richie and says they had a mix-up, Rachel insists she knows her own son, but Richie is taller than Tommy so she should've known something was up.
This episode features Harriette with a piano instructor, but in the credits of season 1 you see her playing it when her credit rolls.
If you watch closely when Steve accuses Eddie of the murder, you can clearly see the mic is caught in the shot.
Steve sucks the fish out of the fish out of the vacuum tube. There's really no way on earth he could manage to suck the fish out of the tube, especially without sucking out anything else. But in the name of comedy, this one slides. It's a great scene.
Waldo claims that after he made some bread and some stuffing, he "got [him]self a gobbler." But even if he had the entire class period for the turkey alone, he still would've had no hope of finishing it; it takes hours to roast a turkey.
We learn Waldo Faldo's middle name is Geraldo.
If Steve had no intention of going to church with the family, then why was he already dressed up when he dropped by their house?
When Laura has her dream, it's established that it's 75 years later when she's 90 and Carl and Harriette are 110. That means in reality Laura is 15, and Carl and Harriette are 35. How could that be when in the episode "Words Hurt," which aired before this episode, it was revealed that Carl's age was 38, not 35.
The Urkel-Bot was created by Kenny Myers who also worked on the Back to the Future trilogy and Star Wars V. The head was made out of fiberglass, his eyes and ears were controlled by RC motors, and a little person was actually in the costume helping move the arms and legs. According to the director of this episode, Richard Correll, the robot was a hit with the studio audience that attended the taping.
Mother Winslow is 80.
As the curtain closes in the scene just before the Balcony Scene, Carl stands up and yells, "Bravo, Juliet!" but Juliet isn't actually in that scene.
Everyone makes a big deal about Laura kissing Steve in the balcony scene, but the first kiss between Romeo and Juliet is in Act One, Scene Five. The Balcony Scene is Act Two Scene Two, so she would have already kissed Steve by then.