Actor Allusion: Paul's grandfather is frequently referred to as "clean" because the actor, Wilfrid Brambell, played a "dirty old man" in Steptoe and Son (which begat the American versionSanford and Son). These jokes would often go over American fans' heads, but British audiences would've gotten the references immediately.
And according to the extras on the DVD, Brambell was a meticulously clean and well dressed man in real life.
Creator Backlash: While he doesn't dislike the film by any means, Richard Lester has often said that it's annoying to have film history classes lecture about how most of the entirely accidental filming techniques used were, in fact, well-orchestrated cinematography worthy of an art-house picture. When told that this film made him "the father of MTV," he replied "I want a DNA test."
Deleted Role: A young Phil Collins appeared in the audience during the performance of "You Can't Do That", which was cut from the film.
It was reported in contemporary press cuttings that 15 minutes was later cut from the film, including scenes involving a London double-decker bus. The Beatles autographed the ceiling of this bus, which was by that time privately owned by Tim Lewis of Twickenham. Many years later, in 1987, David Thrower purchased the bus in a derelict state, from Wicksteed Park, Kettering, and it is now fully restored to the condition it was in when used in the film - though the signatures of the Beatles on the ceiling are long gone, unfortunately.
The song "You Can't Do That" was cut from the concert scene at the end of the film, but the scene in which it is performed is still intact.
Enforced Method Acting: Ringo Starr's hangdog expression during the riverside scene wasn't entirely down to good acting - he was hungover as a result of partying the night before.
Fake Brit: More like "Fake Scouse". Actor John Junkin, who plays the Beatles' roadie Shake, was born in Ealing, a suburb in West London but was told after being cast to pretend to be from Liverpool when he met the Beatles to make them feel more at ease. The Beatles were annoyed at first when they find out a few weeks later but forgave him.
Romance on the Set: George Harrison met his first wife, Pattie Boyd, while shooting this film. She played the blonde schoolgirl who says "Prisoners?" when Paul tries to flirt with her on the train.
Studio Hop: The film was originally a United Artists release, and was licensed from its original owner, American film producer Walter Shenson. After UA lost the rights in 1979, Shenson regained the rights to the film, and since then, three different Hollywood studios have released it: Universal Pictures in 1982, Miramax Films in 2000, and Janus Films in 2014.
In the very first shot of the movie, George Harrison accidentally tripped and fell, and Ringo Starr accidentally fell on him. The falls and the Beatles' laughter about it lent the shot an increased sense of energy and motion, so that footage was left in.
John Lennon wasn't meant to be in the bathtub when George was teaching Shake how to shave, but when Lester found Lennon already there, they decided to work it in.
Director of Photography Gilbert Taylor said that the sped-up aerial shots in "Can't Buy Me Love" came about because the battery in his camera started to die, causing the footage to be "undercranked" and fast motion. When director Richard Lester saw the rushes of the footage, he immediately arranged for more sped-up aerial shots.
Working Title: The movie's working title initially was The Beatles, then Beatlemania, until Ringo Starr who was exhausted after a long day coined a phrase A Hard Day's Night, that was accepted by the studio.