Quite a lot of nasty violence. However, this is all played for laughs for the most part.
During the end battle in Nazi Germany, a lot of anonymous Nazi soldiers are shot, beaten to death or even blown up. This is pretty gory.
A man is sliced in half; blood is seen but this is over very quickly.
People are torn apart limb for limb in a few instances and in one scene, a man twists peoples' heads off like barbie dolls.
There are gunfights throughout.
A man crushes two nazis with a tank.
Please note though that none of the violence is meant to be taken seriously in the slightest- every act of violence is over-the-top, cartoonish and for comedic purposes.