Trivia: Barry Williams admits to having been stoned when the opening scenes were filmed. Watch as he stumbles over the bicycle pump.)
Trivia: During Bobby's dream where the family is killed by Jesse James, Mike Lookinland looks genuinely horrified despite the "cartoon style carnage" that is going on around him. The reason is because just before the scene was filmed, the producer pulled him aside and told him to think of things like his real-life family getting killed, his dog getting run over, etc. He was then "debriefed" afterward. (00:22:15)
You Can't Win 'Em All - S4-E22
Trivia: Edward Knight, who plays the game show host, is the real-life father of Christopher Knight, who plays Peter.
The Subject Was Noses - S4-E18
Trivia: The day this episode aired, Maureen McCormick, who played Marcia, was in a car accident and injured her nose.
Hawaii Bound - S4-E1
Trivia: Greg's surfing accident - which to this day still scares Barry Williams every time he sees it - was nearly left out of the episode because it was deemed "too frightening for the nature of the show". In reality, he was able to turn around at the last minute and while avoiding hitting his head on the exposed coral, his feet became, in his words, "hamburger meat".
Trivia: Rita Wilson - who is now married to Tom Hanks - makes her acting debut, playing "Pat" in the cheerleading scenes. (00:18:35)
Trivia: The man on stage with the young girl is Frank De Vol, who composed the music for the Brady Bunch and many other shows. (00:16:50)
Answer: Much trivia has been written about "The Brady Bunch, " including the various interrelationships and dynamics among the members of the cast. For example, much has been written about why Robert Reed's Mike Brady did not appear in a couple of episodes, including the series finale, due to rancorous creative and artistic differences with series creator, Sherwood Schwartz. However, in contrast, I have never run across any reasons given why a particular child did not appear in specific episodes - only that the episodes were missed. This suggests the causes were likely unexceptional, such as illness, injuries, vacations, or real-life family obligations.
Michael Albert
Although those options ARE possible reasons, it just seems a bit ironic that this happened all in Season 2 ONLY and within a short amount of nearly consecutive episodes. Never happened during the other 5 years of the show at all.