Lloyd Schwartz broke up Maureen and Barry.
Schwartz, a producer on The Brady Bunch, was absolutely worried that Maureen and Barry would screw up set-chemistry with their real life relationship. He apparently convinced Barry to end the relationship by telling him that he was too good looking and young to be in a relationship.
Christopher Knight couldn’t sing at all.
Most members of The Brady Bunch cast could sing fairly well – par for the course in child acting. When it comes to Christopher Knight however, he was so bad that all of his scenes had to be lip synced.