He was unruly on set, always causing trouble, and was just all-around hard to work wih.
Much like the rest of the female population, Susan Dey had a massive crush on her costar, David Cassidy.
Jack, father of David Cassidy and wife of Shirley Jones who was also on the show resented David for the success of the show.
Later on in life, substance abuse issues haunted Bonaduce, who was homeless and living in his car by age 16.