Something 'apocryphal' is thought to be dubious, or of questionable validity. An example of this term used in a sentence would be, 'The witness testimony was apocryphal since the witness was nearly blind, and was not wearing their glasses at the time of the incident.'

The girl in the story wasn't a dead zombie because she was apocryphal.

although we hear numerous stories of Daniel Boone's exploits, many of them are apocryphal

authentic

It could be "apocryphal".

A quote incorrectly recorded is called a "misquote".