Parents Guide for
Sunset Blvd. (1950) More at IMDbPro »

None.

A character is slapped hard on the cheek.

A woman attempts to commit suicide by wrist slitting (implied). We see bandages around her wrists a couple of scenes later.

Norma Desmond shoots Joe Gillis three times with a handgun near the end of the film.

None.

Many of the characters smoke cigarettes throughout the film.

The very start of the film where the main character, Joe Gillis, is lying dead in the pool may be unsettling for younger viewers.

The ending of the film is dark and depressing.