Uncredited Jeff Bridges sang his own song "Lost In Space" on soundtrack of this movie.
When 'Ruth Gordon' won her Supporting Actress Oscar for Rosemary's Baby in April 1969, she was asked backstage by the reporters if Mia Farrow was upset at being overlooked for a nomination in the same film. "Nahhh," Gordon replied, "Besides she'll win it next year for John and Mary." Alas, Farrow was snubbed for this film as well.