In a scene where John Lennon is asking a German Club's owner for a more reasonable work schedule, John refers to their marathons on stage as "a Hard Day's Night." Ringo invented that phrase three or four years LATER, in England (by accident). Also, at the end of the movie, just before the closing credits, it says Pete Best left the Beatles. He didn't, the Beatles left him. It was John, Paul and George, not Pete, who decided on that separation.
shareJohn and Paul rotated around on many of the classic covers (Chuck Berry, Buddy Holly, etc etc) they did in Hamburg, so it's not impossible he might have sung "Long Tall Sally" from time to time.
John usually did "Roll Over Beethoven" on stage in the Cavern and Hamburg years, but it was handed to George to sing on "With the Beatles."
Remember also for many of their Hamburg gigs, they were well tanked up on German beer and sometimes buzzing on pep pills, so it's very possible there were some unusual song performances during those times.
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