John Lennon says to his father, who is miming boxing, "Get in the house Rocky". He is referring to the boxer Rocky Marciano (1923-1969), not the film Rocky (1976).
Towards the end, John and Yoko are shown boarding a jet airplane bound for New York, the date is given as 1971. They are seen boarding a Boeing 747-400 with it's distinctive extended upper deck. This aircraft was not introduced by Boeing until 1988.