During the opening sequence of the group running, George stumbles and falls, and Ringo falls over him. This wasn't intended and George ripped the suit he was wearing, but he quickly recovered, laughed, and continued to run. It was decided to retain the shot in the film.
John Lennon's written answer to the female reporter asking him if he has any hobbies is the word "tits."
The tyre Ringo trips over in the river bank scene had to be thrown again and again, as it kept rolling incorrectly. Finally, after numerous wasted takes, it was offered to young actor David Janson, on hand to play the young boy Ringo meets. Janson rolled the tyre correctly on the first try.
After filming for the day on April 1, 1964, John Lennon had met his father, Alfred Lennon, for the first time in 17 years. In the morning, Alf had walked into NEMS Enterprises (where The Beatles' manager Brian Epstein worked) accompanied by a journalist. He told the receptionist that he was John's father, and when Epstein was informed, he immediately sent for a car to pick up John. The rest of The Beatles--except for Sir Paul McCartney--tagged along to NEMS. The meeting was unsuccessful, however; the first words John said to his father were, "What do you want?" The meeting lasted no longer than 20 minutes, ending up with a furious John ordering Alf off the premises. The encounter was kept out of newspapers by trading with the journalist for exclusive stories about the other bands Epstein managed.
United Artists executives didn't really care about the movie itself, and were mainly interested in exploiting a legal loophole which would allow them to distribute the lucrative soundtrack album. In fact, they fully expected to lose money on the movie. With a final cost of about $500,000 and a box-office take of about $8 million in the first week, this movie is amongst the most profitable (percentage-wise) movies of all time.
Richard Lester: He is seen briefly at the back of the stage while The Beatles perform "Tell Me Why."