A car explodes. No one is injured.
Carl and James briefly wrestle with each other. This is for comedic effect.
Carl, James, and Louis find a corpse in a trash can. This isn't violent, but it may be disturbing for some, though it's meant to be funny. The corpse is seen constantly for most of the movie, and all of it is meant for laughs.
A man is strangled to death with a wire (we see the murder from a distance, we briefly see the strangulation marks, and the dead body is seen throughout the film in a mostly comical way). The killing is the most violent moment in the movie, but it's not bad at all.
2 men are shot in the butt with a BB gun. Both scenes are played for laughs, and neither scene is at all violent.
A villain tasers another villain.
There's a large-scale final battle in which Carl, James, and Louis take on lots of bad guys. Lots of slapstick fighting occurs, and none of it is very brutal. Carl hits several men in the face with the butt of his gun, James, flips several men over, and Louis fights off a few men with punches and kicks. None of this is brutal or violent.
Two very disgusting scenes in which two guys in their underwear are splattered with large amounts of excrement as a prank. The first time, they are pranked by Carl and James, and the second, their own prank backfires on them.