Mr. Hyde is shown beating two people to death with a cane.
In a surreal sequence Hyde looks at all the wanted posters as a montage of him beating people to death plays.
Mr. Hyde is seen three times abusing Jekyll's pet cat. The first time involves him throwing a measuring glass at it, the second time involves him throwing his top hat at the cat, by the third time he's ditched the projectiles and instead tries to beat the cat with a cane about 3 times before giving up and just throwing it at the feline.
There are also two (heavily) implied murders. One has Mr. Hyde vandalizing a woman's fruit cart who then proceeds to stop him. Mr. Hyde then raises his cane as the woman gasps in horror, and we get a shot of policemen running after Hyde, while the scene is vague enough to imply that Hyde simply knocked her down, most children will think that Mr. Hyde did indeed kill her.
The second implied murder is quite frankly more obvious, not to mention more disturbing. This one involves a young woman walking down a street at night. As she walks onward we see a shadow of Mr. Hyde sneaking up on her. When she turns her head back again, Mr. Hyde appears in front of her and snatches her away while evilly laughing.