Loki shoots at Tim repeatedly in various scenes, with cartoonish excess.
Otis the dog tries to give Alvey a firecracker disguised as a rattle; Alvey gives it back disguised as a bone and it blows up the dog.
Alvey and Otis the dog fight violently (at one point swinging the dog by the tail so he hits all the walls in the room, smashing furniture, etc. and then blows the dog up after it surrenders with a white flag -- this sequence is very violent, though all cartoonish).
Otis the dog imagines putting a bomb in Alvey's diaper, shooting him out of a cannon, spinning him in a ceiling fan, and tarring and feathering him. Alvey turns all this around and does it to the dog, including sending him through one of those laundry wringers, flattening him (but both are okay afterwards).
Loki, Tim, and Alvey fight violently, using guns, electricity, explosives, and garbage dumpsters (Alvey works magic to slam Loki between them). They look charred at times (in a cartoon fashion, but are otherwise okay later).
Loki wields a giant axe, and later, a hammer, smashing the sidewalk around Tim. Loki throws an oversized hand grenade at Tim and Alvey; and the baby puts up a shield.
There's a boxing match between Tim as the Mask and Loki.
Otis the dog, while under the influence of the mask, bites someone's crotch.