Plot hole: Dr. Tuskin warns that if Regan were to remember the events of her possession it could be so traumatic for her it could lead to suicide, even though Regan's therapy seems to be based almost entirely on what she can remember about the events of her possession.
TonyPH
19th Apr 2021
Exorcist II: The Heretic (1977)
16th Mar 2021
Alien (1979)
Plot hole: The shuttle "won't take four" crew members. Considering it only has two cryotubes (and hypersleep appears to be necessary for any hope of survival), it doesn't seem to accommodate three people, either. (Admittedly I would still go for it, too, if I were up against a 7-foot-tall acid-blooded alien monster with two sets of jaws, but there doesn't seem to be much difference whether there's three or four people onboard).
Upvote valid corrections to help move entries into the corrections section.
Suggested correction: As was standard, the Narcissus (which was the name of the shuttle) was designed to carry a crew of three, although the interior could be easily modified to seat more crew members if necessary. For long-duration travel, the shuttle contained two stasis capsules, although long-range interstellar transit was not the vessel's primary purpose. So in a life-or-death situation, four people intending to use it to get off the Nostromo isn't a plot hole.
I'm not sure I understand the correction. The reason Ripley rules out escaping on the shuttle at first is because it does not accommodate four crew members. When she later changes her mind after they've destroyed Ash, the natural assumption is that the shuttle has become a viable option now that they're down to three, but we later see that wasn't actually the case, because it only has two cryotubes. A better argument, I think, is that at that point they simply no longer cared.