Two people can be heard having sex. There is a lot of screaming and moaning, though it is comic and exaggerated.

A man is briefly seen completely nude and from behind with genitals barely visible.

A man is hit by a car. The scene ends before anything much can be seen.

A seagull is shot (off-screen), only sound is heard.

A man threatens a man with a gun (holds it to his face).

The word "fuck" is said four times, though one of the times it is obscured by a car horn.

One use of "bitch".

Two or three uses of "bastard".

Some uses of the words "shit", "hell", "bloody", "piss" and "damn".

Some people smoke and drink.

The alien and alien autopsy scene can be disturbing due to its graphic and realistic nature, but it is explicitly stated within the movie that it's fake.