Although Dr. Crippen was hanged in 1910, his lover Ethel Le Neve was still alive when this film was released (she died in 1967).
Donald Pleasence received the script for Dr. Crippen (1963) while he was making The Great Escape (1963). His friend David McCallum, with whom he was working on that film at the time and lived next door to during filming, told Pleasence not to do the film. But Pleasence accepted the role because he felt it was a good part. He started filming immediately after finishing The Great Escape.
Regarded as the first criminal case where the suspect was apprehended through the use of radio communication.