Mistakes
When Ripley backs into the shuttle closet you can see three axes on the wall next to her, when she starts to get into the space suit there are only two, then when she puts the helmet on there is only one. See more...
Trivia
Originally, director Ridley Scott wanted "Alien" to have a much darker ending. His intention was to have the alien get back on board the shuttle, rip Ripley's head off and then calmly sit down in her chair and record the final transmission, speaking in her voice. The producers understandably found this a little too extreme, so Scott tried changing it to having Ripley go to sleep as normal only for the camera to pull back out of the airlock's window and reveal an alien egg, in the process of hatching, attached to the outside of the shuttle (after the "Brett/Dallas egg mutation" scene was deleted, this also had to go). See more...
Movie Mistakes blog
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The entry you are marking as a duplicate is:
| Title | Alien |
|---|---|
| Original entry | While the Alien is bursting out of Kane's chest, notice how the blood stain on his shirt changes in size from a large stain to a small one and finally back to a large one. |