Factual error: When Dorthy comes to sunbathe on the beach, mountains of approximately 500 feet in elevation are seen but Nantucket Island's highest elevations are in the 100 foot range. (00:14:55)
Factual error: There is a picture of Elvis in Jacy Farrow's bedroom. The film depicts a small Texas town in 1951 to 1952. Elvis' first recording was in 1953 and he did not become famous by any sense of the word before 1954.
Factual error: The calendar in the police office indicates Tuesday January 27th and Thursday January 29th. That was in 1970, but this story takes place in 1971.
Factual error: Raquel Welch is shown to have modern tooth fillings during the rape scene.
Factual error: The film begins with a caption saying it's Germany, year 1195, Durrestein castle. That's kind of two mistakes and a half in a single line; Richard Lionheart was held captive in a castle in modern Austria (Germany is an acceptable approximation, arguably, considering Austria was not an autonomous state), but it was called Dürnstein castle, and more importantly, Robin Hood wouldn't meet him there as a captive in 1195, given the fact that he had already been released two years prior.
Factual error: When Mission Control tracks the orbiting Apollo spacecraft, the ship's ground track up on the big map has it moving across North America parallel to a line of latitude. With the exception of orbiting directly over the Equator, this is impossible.
Factual error: At Portobello Market, when the kids are eating, there's a sign that reads "cookies." No chance there would have been anything like that in 40's London. It would definitely have read "biscuits."