Some infrequent mild innuendo, will go over kids' heads.

Just mild comedic slap-stick violence.

"Darn" and "dang" are sometimes used.

"Crud" (which is pretty much the equivalent of "crap") is used in some episodes, by Timon.

Some episodes have horror themes, but since they are very light and comedic in nature, maybe only very young children will think it's the least bit frightening.