I reconsidered a couple things I think the trailers should do. In the last post I mentioned that I no longer think it should be a spoiler that Bunny returns in the 2nd movie. So I now think that she should be in the trailers albeit with minimal screen time, therefore meaning that audiences will see it coming that she is back from the dead and no longer deformed for the 2nd movie. But as for true spoilers to avoid for the trailers, they should not spoil that the Rowdyruff Boys become good guys at the end, because I think that should be the biggest spoiler unless the writers think of a much bigger and better spoiler that no one will see coming.