In March 2010, Buchanan supported Sarah Monahan, a co-star on the Hey Dad..! television show, over allegations that fellow star Robert Hughes had engaged in inappropriate sexual behaviour on the set of the show. Buchanan claimed she had approached the show's producer about the alleged assaults but that he instructed her to keep quiet. She testified at Hughes' 2014 trial that she only heard allegations about his inappropriate behaviour and never saw it for herself.
