Brighton Borough Council refused permission for use of the race course because of the damage association with gang crime would do to the town's image (see the on-screen disclaimer at the start of the film).
"You are Colly Kibber and I claim the Daily Messenger prize" -- this was actually paraphrasing The News Chronicle who had a promotional character called Lobby Ludd who toured seaside towns giving away £5 notes when being successfully challenged.
The trivia item below may give away important plot points.
The film was meant to end with Rose listening to the poisonous recording made by Pinkie, which contained the line, "You asked me to make a record of me voice; well, here it is. What you want me to say is 'I love you'. Here's the truth: I hate you, you little slut..." However, author-screenwriter Graham Greene felt the ending would be vetoed by the British Board of Film Censors so he wrote a happy ending. In this version, the film ends with the record needle getting stuck and repeating the phrase "I love you..." The camera then tilts up to a crucifix, suggesting Rose's salvation. Greene has been quoted as noting: "Anybody who had any sense would know that next time Rose would probably push the needle over the scratch and get the full message."