A boy's nose bleeds twice in the film.
When Merlin eats some small rocks, his teeth are shown with blood on them.
Shrek accidentally kills a man off screen. Played for laughs.
Shrek accidentally pushes a ship and sends it sailing. He tries to stop the ship by throwing a glass bottle at it, but it only makes the ship sink. The people on the ship then jump into the water. This is played for laughs.
Shrek has an infant-induced nightmare, where ogre babies are crashing things, but are not hurt. A stampede of them chase Shrek. See Frightening and Intense scenes for more.
3D computer animated comic violence.
Some clumsy pratfalls.
Part of Shrek's stuffy and stiff royal costume pops off and hits Donkey. That sets off a comedy-based chain reaction of chaos where various things or characters accidentally smash into other things or characters, including a small fire breaking out.
Overall fighting and slapstick throughout the film.