While Travis Walton's abduction tale aboard a flying saucer is beat-for-beat almost identical to a couple of Heinlein stories, a few details seem to have been drawn from other science fiction sources of the era.
Curt Collins posted a 1967 comic on UFO UpDates with aliens and their "surgery" that bear similarities to Travis's alleged experience. Then there's Captain Kirk's command chair, Dr McCoy's medical equipment, and the 2001: A Space Odyssey cockpit screens and buttons...
Not to disparage classic science fiction, which at the time looked futuristic, but I'd be so disappointed if a real alien spaceship looked like it came from the imaginations of 1960s Hollywood writers.
Read my update with illustrations and quotes from Travis's book.