A few innuendos.

a girl kisses a boy in his cheek. then he gets red

helga mentions several times she's in love with arnold

Harold flashes his bottom in a presentation but it's played for laughs.

Helga And Arnold Kiss For 5 Seconds

Lots of characters die horribly. Lasombra gets shot in the head with an arrow, poisoning him.

Mild profanity.

Arnold's pig Abner is seen drinking from a martini glass.

There are a few fight scenes with Arnold, his friends, and their parents in the jungle that can get very intense for younger audiences.