Those shots of equipment for Doc Ock and The Vulture are used as a big DUM DUM DUM shot near the very end of the film, but we've already seen them in the trailers so it's ruined.
And this really amazed me, literally the last awesome two shots of the movie are used in the trailers, ridiculous.
If you want to be really spoiled, it's the last part of this trailer- https://www.youtube.com/watch?v=DlM2CWNTQ84
Don't say I didn't warn you if you don't want it to be spoiled.
It would be like advertising the first Iron Man with a clip of Nick Fury at the end. Although... saying that, IIRC didn't The Incredible Hulk tv spots show how Tony Stark appeared at the end? So maybe it's nothing new. I still think ruining the last shot of ASM2 was really lame though
Well, keep in mind the people who make the movie and the people who make the trailers are usually two different groups and the people who make the trailer want to get you to see the movie so they're going to go with shots/scenes that will most likely get butts in the seats, spoilers be dammed.