The Treasure of Sierra Avenue - S2-E7
Visible crew/equipment: The set lights are reflected in Greg's beach ball in what is supposed to be an outdoor scene. (00:20:35)
Visible crew/equipment: A shadow of a boom mic is visible moving across the brick wall just as Alice starts to punch Mike in the stomach.
Confessions, Confessions - S2-E12
Visible crew/equipment: The shadow of what appears to be a moving camera can be seen moving across the pieces of broken vase. (00:02:35)
Confessions, Confessions - S2-E12
Visible crew/equipment: During dinner, when the freshly glued vase with the flowers springs a few leaks we can see the top of the kitchen set in some shots, particularly when Alice makes the joke about three coins for the fountain.
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.