According to Richard Dreyfuss, he believed his performance in this film was so bad that his career would be over when it was released. This fear caused him to aggressively pursue the role of Matt Hooper in Jaws (1975).
The character of the blacklisted left-wing film-maker played by Denholm Elliott is named "Peter John Fryer", although he is referred to mostly by surname only. The full name suggests a joking reference to the British film critic Peter John Dyer - Mordecai Richler, the writer of the film had worked as a film critic in England in the early 1960s, when Dyer was well-known there.
When Richard Dreyfuss was offered the role of 'Matt Hooper' in "Jaws", he turned Steven Spielberg down flat because he thought the offers would come flooding in after this film's release. When Dreyfuss saw himself up on the big screen as 'Duddy Kravitz', he was convinced his film career was finished. He then telephoned Spielberg and begged him to cast him as 'Hooper'. "Jaws" was released in the Summer of 1975 and became the first huge 'Summer blockbuster', making over $100 million!