Shortly after the start of the program, Cindy walks past Bobby and his three friends while she is holding a full avocado-green household plastic trash can, probably on her way toward the garbage pail outside. Seconds later, in a new camera angle, Cindy turns to talk to Bobby, but the green trash can is now gone.
Jan tells Carol that Marcia volunteered to drive to Jan's first aid test after school. Marcia does not receive her driver's license until later in the season in the episode "The Driver's Seat" (5.15). Carol says she will drive, but not be the victim. Jan says Marcia volunteered to be the victim. Marcia says she had no choice, because she had a bandage covering her mouth.
When Cindy wakes up in the middle of the night to write the letter to Joe Namath, she turns on a lamp. The light obviously does not come from the lamp, but from behind it, as you can see on the wall a shadow of the entire lamp.