timdiggerm said:

Was there really anything interesting in the film that one could spoil, if one had already seen the OT?

It was the smaller details, like Anakin killing younglings or chopping of Mace's hand. Things like that you'd expect, but not explicitly knowing would be a bit more surprised upon seeing them.

Also Padme dying. Many people were wondering if it would happen. I suppose the movie tips its hand early that it will happen, but same as above. Impact slightly lessened.

Oh no, I'm thinking about ROTS again. It's all coming back to me. "No I'm so in love with YOU." Ohh, ohhh noooo.