When Jan first opens the box containing the locket, a closeup is shown of the box opening. The box is opened facing the camera rather than toward Jan. Unless she thought something was going to jump out at her, there's no way she would open it so she couldn't see what was inside first.
After enjoying a meal that Marcia cooked, Carol is shown getting up from the table with her dinner napkin attached to her belt.
Carol and Cindy look for Marcia's diary in "Gilbert's Books"
Barry Williams (Greg) and Christopher Knight (Peter) once joked that this episode was the basis for the term "A Peter Brady Party"--in other words, a party that nobody actually attends.
Actor David Morick, here portraying a newspaper reporter, previously co-starred as Corporal Sontag "Hogan's Heroes".
Actor Joe Conley (deliveryman) would later go on to play shopkeeper Ike Godsey in The Waltons.
Actress Danny Sue Nolan, here playing the mother of the little girl in the toy shop, was the first wife of legendary Hollywood producer William Asher. After their divorce, Asher went on to marry actress Elizabeth Montgomery (Bewitched) and later, acterss Joyce Bulifant (The Mary Tyler Moore Show). Ironically, it was Bulifant who was first offered the role of Carol Brady in The Brady Bunch. Danny Sue Nolan died in 2002.
The doll that Tina, the little girl Peter saves, is trying to get in the toy store is a Kitty Karry-All. This is the same doll that Cindy has.
This wouldn't be the first time Peter threw a party for himself. It also happened in "The Personality Kid" when he wants to show off his new jokes.
Look closely at the wallpaper in the background when Peter is calling his friends to invite them to his party. Some of them appear to be calling from Mike and Carol's bedroom!
In this episode when the shelf falls you can see a rope at the top of the screen pull the shelf down.
During the scene when Marcia is in the kitchen trying to eat spaghetti: when the camera starts to pan out, look carefully at Carol, who is in the background behind the counter. You can clearly see that she is looking up at the director to give her her cue after the camera fully pulls out. She's holding a dish towel and silverware, waiting. As soon as the camera stops moving, you can see where she gets her cue, because she suddenly gets a big smile on her face and busily begins to wipe the silverware and say her line.
Marcia's date in this episode is named Alan. The press, however, wrote it down as Craig.
This episode gave the usually sunny and happy Marcia Brady some intense crying scenes. Actress Maureen McCormick has admitted that although her castmates didn't know it at the time, all her tears were real, because she was going through a lot of emotional trauma at home. Shortly before the episode was filmed, McCormick's parents had gotten into a horrible fight, and her father admitted to having an affair with a family friend. McCormick claims that she "summoned the tears easily" for this and any other episode that required her to get upset, and they were actually some of her favorite scenes, because with the difficult home life she had, it was a good release for her.
In the scene with Cindy and Marcia in the bathroom, Marcia's braces are gone! If you look closely, they have slid up to the top of her teeth and are on her gums. This happens several other times in this episode.
Look closely and you'll notice that there's no glass in the sliding glass doors at the Brady house.
In the scene with Cindy and Marcia in the bathroom, you can tell that the amount of facial cream on Marcia keeps changing between shots.
During Mike's phone conversation with Carol, Jan and Marcia's argument was echoed.
Resting her ankle in bed, Alice reads a book called "All My Loves"
The scene where Carol is calling from Aunt Mary's house is actually Mike and Carol's bedroom!