In one scene Chuck is in a surgery bed and then he gets out of the blanket. Skiff says that's a weird place for his antenna a penis joke

Alien guard at base 9 is looking at a magazine and it shows an alien as Marilyn Monroe in her classic white dress pose and her whistles at it. Suggestive.

Alien brains are shown in jars after an implied brain removal surgery.

A male alien tries to dance with a girl but ends up getting pushed.

All the violence in this movie is cartoon violence.

At the very beginning, an odd-looking alien astronaut, descended from a spaceship, starts firing with a laser-like beam from his only head-sized eye on what it is believed to be Earthmen. Explosions are visible and some characters are disintegrated, but it is later revealed that it was an alien-produced science fiction film and the spectator acknowledges that the men in the film were actually not human, but rather Planet 51 natives.

Throughout the film characters are shot at.

Creatures fire at each other then are electrocuted.

An alien lizard/bug is squashed.

One use of "Ass" as lem tries to say "astronaut"

An alien child chugs a bottle of cough syrup

None.

Title refers to Area 51, if u do, spider will come to you tonight and eat u for dinner.

The opening scene with the alien invasion could be considered by some children to be a scary.