Trivia: The 1966 T.V. Batmobile was created from a decade-old "concept show car" designed and built in 1955 by Ford's Lincoln Division. It was called the Lincoln Futura, and was originally a pearlescent pale green. After several years on the car show rounds (and an appearance in one movie, repainted red), it was sold for $1 to George Barris who stored it outdoors for 6 years. When FOX called looking for Barris to build a car for the show, they gave him 3 weeks, so he grabbed this already-weird looking car he had out back, sketched a few changes and passed the physical work to Bill Cushenberry. It was finished on time and the rest is history.
Pregnant Women Are Unpredictable - S2-E16
Trivia: When Lucy's reading the book about infant care, she's holding a baby doll wearing a bonnet in order to learn how to bathe and diaper a baby, and the doll she's using is not just any prop. It's actually one of the show's endorsed products named the "I Love Lucy Baby" doll, which were sold in stores.
The Scorn of the Star Sapphire! - S3-E5
Trivia: After freeing Miss Taylor from the grip of Star Sapphire, Green Lantern encases her in a green energy box and flies her away. The box is shaped almost exactly like a shuttle craft from Star Trek. (00:15:50)
Trivia: When Josh has the broken foot, the hospital he goes to is called St. Schneider's. This is a reference to the show's director, Dan Schneider.
The Karate Kid Returns - S6-E14
Trivia: At the end of the episode when Jill is asking to sing with the Beach Boys, Wilson's entire face is visible for a split-second (for those unfamiliar with the show, one of its running gags is that Wilson's face is always partially obscured, usually the lower half). (00:21:10)
Trivia: Walter Jones (Zack the Black Ranger) is missing his left middle finger. If you look closely you'll see it missing at various times throughout the show. Particularly when he morphs (he's the only one that only has three fingers on top of the morpher).
Love and Cheese / Weighing Harold - S4-E7
Trivia: In 'Weighing Harold', when Arnold is in the comics store, there are comics in the background referencing other Nickelodeon shows, "Catdog" and "Spongebob Squarepants." The former had aired almost exactly a year before this episode did ('Catdog' premiered on 4/4/1998 and this episode on 4/7/1999). The later aired about a month after this episode.
Excuse Me, May I Cut In? - S2-E4
Trivia: Gary Marshall is playing the drums, I think.
The Red Sea Sharks: Part 1 - S3-E1
Trivia: The Emir's hideout is strongly based on the Al-Khazneh temple at Petra. (00:19:25)
Trivia: D.J. throws a life buoy onto a man which says SS Papouli on it. In Full House, Danny buys a boat and names it this in memory of the family's beloved Papouli.
Trivia: The episode starts off with Dee Dee eating scraps, while Marky looks over stuff. Later on, Marky found what seems to be an Identity Card that belongs to Joey. Here, the card shows that Joey's birthday is on June 15th, 1991. (00:00:14)
Suggested correction: Is there some sort of special offscreen significance to this birthday? Because I don't see how this constitutes trivia if it's blatantly shown onscreen.