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I can tell you that they are keeping secrets. Harry Osborn isn't the real Green Goblin, Norman Osborn will become the real one after Harry is most likely killed by Peter in revenge for Gwen's death. Full of rage at Peter Parker/Spider-Man for killing his son, Norman takes a strong dose of the Goblin serum, and becomes the ultimate Green Goblin.Well, I think it both seems like a lot, and not very much at all. We're all here going 'They're showing too much of the film', and I suppose they are, but then again, they're only showing a few extended sequences. Most of what we see in the trailer are jumbled up shots only a second long each, if that. So what we've seen is pretty scattered. The scary part is that they've shown six accumulative minutes of that.
Though there are things we probably didn't need to see, like the Goblin. A HINT of the Goblin would've been good, like in The Dark Knight trailer, that one shot of Harvey's face in the oil. It didn't explicitly show Two-Face at all, but we all knew it was coming. Then again, maybe there will be events in the film that they are keeping a secret, so the arrival of the Goblin pales in comparison. Who knows?