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Working as a tech-support phone operator, Donatello tells an unheard caller that he's not leading them on, adding that it's not that kind of phone line (younger kids won't understand the phone sex innuendo).April and Casey also kiss.
We briefly see a long-distance view of a massive battle from the past where Winters and his small army fight others (striking and otherwise hitting them with swords, etc., but with no blood).
At least 1 damn (and possibly more) is heard in a song.
The appearance of some of the 13 monsters (sharp teeth, acting violent, etc.) might be unsettling or even scary to very young viewers.
