Angela Douglas was terrified about her singing sequence. Joan Sims literally pushed her onto the sound stage, having given her two brandies before she went on!
Sidney James had experience from riding a horse in Australia. He loved the horse that he rode for the film; in unseen footage from a news-crew that hung around the cast during filming, Sid is seen talking excitedly about his horse, calls it his "girlfriend" and kisses it, claiming that he wouldn't let her kiss him.
This has the distinction of being the only Western film in history where the town has a left hand turn at the end of the main road. This was due to the fact that Pinewood didn't have sprawling prairies behind it.
Gerald Thomas was proud of the fact that, of the 31 films he directed, this was the only one that went behind schedule - by one day. This was due to heavy rain in the initial stages of location filming which cost the loss of the first day.
The first film in the series to feature "Carry On..." regulars Peter Butterworth and Bernard Bresslaw.
Eric Rogers' brother Alan Rogers wrote the saloon song "This is the night for love" and if you look closely you can see Alan playing the piano in the saloon.
Peter Rogers wanted to have Charles Hawtrey sing a quick snatch of Rose Marie's "When I'm Calling You Ooh", but the American publishing house wouldn't allow it.
The Beatles were being considered for a western called A Talent for Loving in 1965, giving Peter Rogers and Gerald Thomas a challenge to see whether they could beat them at the box office. (Ultimately, The Beatles unanimously rejected the script; A Talent for Loving (1969) was released instead in 1969 starring Richard Widmark, Topol, and Cesar Romero.)
For the stagecoach scene, you can see it racing across open country near Esher in Surrey with dust flying up from the wheels. This was provided by a crewman sitting in the coach with a powder gun and despite the fact that the horses were kicking up mud as it was one of the wettest days on location.
Jim Dale trained for two weeks to learn the gun tricks that appear on screen for a total of half a minute.
Kenneth Williams described this as his favourite of the Carry On films, even going as far as praising Sid James' performance - Someone he usually maligned in his diaries.
Music composer Eric Rogers makes his film debut as the saloon pianist playing for Angela Douglas.
Jim Dale later appears in another comedy western called Hot Lead and Cold Feet (1978).
Sheriff Earp's glasses are clearly seen to have a hole in the middle of each lens - to allow the character to actually see through the thick glass.
Opening credits: All characters and events in this film are fictitious. Any similarity to actual events or persons, living or dead, is purely coincidental.
The 'peace on...peace off' story joke that Sid James's character tells near the beginning of the film gave the British Board of Film Censors a bit of a headache as they thought it was inappropriate for an A rated film in that era. Eventually they changed their mind and let it through when it was pointed out that Charles Hawtrey's 'Big Heap' has said a mild expletive ("Bloody") in the film and they hadn't even noticed it in their notes.