Joan Collins has a cameo role as her real-life husband Maxwell Reed's girlfriend in the film. He accused her of trying to upstage him. She wrote in her autobiography that she was inexperienced in film acting at the time and that she had no idea how to do a lot of things, let alone upstage anyone. She was uneasy during their scenes together for fear of displeasing him.
Opening credits: The events and characters portrayed in this film are wholly fictitious.
The story used for this film would have suited Sidney James, owing to his having boxed a few times in real life.