There are some scary looking dinosaurs, and a couple of people do die: one is instantaneously turned into a skeleton and fossilized on a cave wall, and the other turns into green slime. The weapons used are primarily flame-throwers, and while one creature (a humanoid with a lizard head) catches fire, he's not harmed.

A small dinosaur -- supposed to be the equivalent of a dog -- gnaws on a woman's foot, and she promptly stabs him; both seem uninjured.

A man is changed into a chimpanzee.

Gore is mainly of the disgusting and slimy variety.

There are various threats of violence.

2 misuses of "hell." Both are near the beginning of the movie.

One minor character is seen with a cigarette in her hand most of the time she is on-screen.

The entirety of the de-evolution scene.

Goombas in this movie look creepy

Koopa's kingdom is a dark and derelict dystopia.

There is a police car chase where Mario and Luigi drive the police car out of town while being chased and attacked by other policeman.