The box claims that it's "a killing spree more brutal than any ever seen in the annals of filmmaking." That is a bit exaggerated. Poor Albert (and his theme song) only kills three people, and his mother is not one of them. He never even attempts to kill his mother. [source]
He falls in love with a nine-year-old girl. It's almost happily ever until she sees him kill a hooker. Not a lot of gore, but there are a lot of boobs from chicks about to get murdered. [source]