** The 1956 version ends with the cops catching the snatchers in the act, because the studio thought the original ending was too dark.
** The 2007 version had a particularly bad case of this. The original director Oliver Hirschbiegel turned in a cut that was, like the previous versions, a psychological thriller. The studio wanted an action flick however, and hired the Wachowski brothers to refilm the entire third act.
** British actress Dana Wynter plays Becky Driscoll in the original. They got around it in the script by saying the character had just returned to the US after having lived in England for several years.
** Another Englishwoman, Gabrielle Anwar, played the heroine in the 1993 version.
** The 1978 version features [[Series/StarTrekTheOriginalSeries Mr. Spock]] as a sort of Dr. Spock. [[spoiler:And people ''actually'' noticed that he had been replaced by a pod?]]
** [[TheDickVanDykeShow Mel Cooley]] is one of the mental hospital doctors in the prologue/epilogue to the 1956 version.
* PlayingAgainstType: The 1978 version. We're all used to seeing Leonard Nimoy [[Series/StarTrekTheOriginalSeries without emotions]], but it isn't normally this creepy.