In this episode in the dream sequence there is a tricycle in the yard. None of the kids needed a tricycle in the entire series so it shouldn't have been there ever.
Peter and Bobby appear to have switched beds in this episode. In the previous episodes where we see the boys sleeping, Peter sleeps in the bed to the left of the closet, and Bobby sleeps in the one to the left of the bathroom door. But in this episode it's the other way around.
When Peter and Bobby first sees the U.F.O., and if it's from Greg's bedroom, the problem is that Greg's window, is on the oppisite side of the house.
Marcia: (finds out the trick Greg is playing) So you're the UFO. Isn't that kind of a dirty trick?
Greg: I was just getting even with those two creeps for telling Mom and Dad I got home late Saturday night.
Marcia: Well, it's still a dirty trick. But I love it because they squealed on me last week too!
Bobby: (after McDivitt shakes his hand) Wow, I'm not gonna wash that hand for a month.
Peter: Big deal. You wouldn't wash it anyway.
Greg: How am I supposed to get there without a car?
Carol: I suppose you'll have to hitch a ride on a UFO.
This is the last episode where Greg loses the car.
Frank and Sadie Delfino play the "Kaplutians" in this episode. In reality, they worked as Mike Lookinland and Susan Olsen's stand-ins.
When this show first aired a brief preview for the next episode is shown. In that preview Carol tells Mike that they will be having an addition to the family. That addition, of course, would become the infamous Cousin Oliver.
In one scene, Greg explains he "cut himself shaving." The "cut" was actually the result of injuries Barry Williams suffered in a car accident the weekend before filming.