Quoted from Barry Miles' Many Years From Now:
p. 287: 'She Said She Said' had its origins in something that the actor Peter Fonda
said. The Beatles were holed up in a house in Benedict Canyon, Los Angeles, during their summer 1965 American tour.
Surrounded by police and thousands of fans, two of whom tried to land in the garden in a helicopter, the besieged Beatles
had no choice but to party at home. Roger McGuinn and Dave Crosby from the Byrds were there as well as Peter Fonda. They had
spent the afternoon watching Jane Fonda's Cat Ballou (described by Pauline Kael as 'uneven, lumpy, coy and obvious'),
which John had hated. Afterwards John and George used the occasion to take an acid trip. George sat out on the deck with
Fonda and told him he felt that he was dying. Fonda, an old hand at tripping out, calmed him, saying there was nothing to
fear and that all he had to do was relax. He said that when he was a child he had almost died on the operating table and
told George, 'I know what it's like to be dead.' John was passing and heard him. He had already had enough of the Fondas
from watching Cat Ballou and snapped, 'Who put that shit in your head?' before turning to an aide and demanding 'Get
this guy out of here.' However, John obviously filed away the phrase for later use.
It was a song that Paul liked. 'Very much John. It's a nice one. I like the title "She Said She Said", which I think was made up on the session. John brought it in pretty much finished, I think. I'm not sure but I think it was one of the only Beatle records I never played on. I think we'd had a barney or something and I said, "Oh, fuck you!" and they said, "Well, we'll do it." I think George played bass.' (EMI studio records do not mention this.)