Sorry to bump up a thred that is on page 2 but I want to put my 2 cents in as well...
It's Norman, plain and simple.
Octavius' "accedent" was SUPPOSED to kill him, Norman knew that Otto was a liability to his illegal experiments, so not being able to do it normally, he had to dress up in his garish costume to do so. I mean, if it WASN'T Norman, what would be the point in the Goblin attacking Octavius?
Do you REALLY think that a man who would rather die than apologize for stealing technology would take the fall?
Also, Spider-Man was stupid to tell Goblin that he knew Gobby's identity. Norman knew that because Spider-Man did know who he was that his home would be the webhead's first stop, and Harry happens to be passed out on the couch so...there we go... As for Harry's leg, he probably hit it on something when he passed out, so of course he wouldn't remember how it happened. Gobby faked his leg being hurt...