Almost nothing. One reference to reproduction, but not as a joke.

A villain's arms are severed. No gore, but a bit of blood.

Another character's arm is cut off. It is seen falling down a flight of steps.

Bad guys die in typical action fashion, (getting shot, falling off of buildings)

Mild language, nothing worse than a PG-13 Movie.

Some characters drink, and one gets drunk.

A LOT of smoking. One character specifically smokes an insane amount of cigarettes over the course of the show.