In one scene, there are pictures of nude women pinned to the wall in the background. They're clearly visible. This moment happens at 1:21:55-1:23:15 (Theatrical) / 1:20:00-1:21:45 (Director's Cut)

Not noticeable at all but in the opening of the movie when the crew wakes up out of hyper sleep, if you look closely you can see a topless women with covered nipples. This moment happens at 5:40 in the movie (both theatrical & director's cut)

Apart from one scene the violence and gore is of a moderate level. Overall this movie is probably on par with Jaws.

Blood starts to pour and "rain" down on two characters, right after another character is killed offscreen

Film has some offscreen kills.

The alien shoots its teeth into a man's head. (quickly, before the camera cuts away). Minor gore.

In the directors cut an alien bites into a man's head.

A character is killed offscreen, but their scream is heard.

A man cuts a "finger" of a facehugger and it bleeds acid.

A woman is punched, which causes her nose to bleed.

5 uses of the F word, 8 uses of 'Shit', 18 uses of 'Hell' 11 uses of "Goddamn" 10 uses of 'God' 5 uses of 'Son of a bitch' 2 uses of "Jesus" 1 use of 'Ass' 1 use of 'Crap' 1 use of "For Christ's sake" 1 use of "For God's sake" and 1 use of "Jesus Christ".

'B*tch' is said at least twice.

The crew members smoke cigarettes and drink canned beer.

The main characters are in mortal danger for a large portion of the film.