Kathy Etchingham was never beaten with a telephone, as depicted in one scene. According to the real Kathy Etchingham, it was "completely made up."
The band Queen is mentioned twice as being one of the groups involved in the London scene in 1967.
When Radio Caroline is playing in one scene, the song playing is "Train To Nowhere" by Savoy Brown, issued in 1969.
When Jimi Hendrix meets Cream, bassist Jack Bruce is using a Fender P Bass. Bruce was known for using a Fender Bass VI and a Gibson EB3.
A Bell Telephone push button phone is in Jimi Hendrix's hotel room in late September 1966. Push button phones did not become widespread in the UK until the 1980s. A British hotel would not have an American-made telephone.
In England in the late 1960s, marijuana was called "pot" or "grass," not weed.
The dialogue contains modern slang, like "hella good."
Linda Keith lends Jimi Hendrix a white electric guitar. In real life, she lent him a Fender Stratocaster. The guitar in the movie is a Fender Stratocaster, but not a 1960s model.
A close-up of the white Fender Stratocaster guitar shows new-style block bridge pieces, which did not exist in 1966.