From season 3 of The Brady Bunch:
The Bradys are selected to star in a laundry detergent commercial, which has the boys (Barry Williams, Christopher Knight, Mike Lookinland) thinking of bigger paydays. Paul Winchell guest stars as the hippie director assigned to the shoot.
Also dedicated in memory of Florence Henderson (Carol), who passed away earlier this week at 82.
The theme music was slowed down to extend the length of the video, which is another way of getting around copyright regulations.