Definitely shows that it's a live-action Disney production - bloodless plot, nice looking sets and location shooting in pastoral England, overqualified adult cast (Bette Davis, Ian Bannen, Carroll Baker), could just as well have premiered as a Wonderful World of Disney Sunday night feature presentation (when they used to do that sort of thing) instead of being released to theaters.
They re-shot and edited it after it came out, to tone down the horror, so in the official version now there's no xenomorph-type alien monster at the end (replaced by a glowing shape of light, which may fit the nature of the movie better but sure isn't as fun to look at), and what other spookiness does the movie have…