Question: How did The Green Goblin get captured and sent to Ravencroft after he killed Gwen?
TedStixon
12th May 2017
The Amazing Spider-Man 2 (2014)
26th Nov 2022
The Amazing Spider-Man 2 (2014)
Question: Why wasn't Chris Cooper credited for his role as Norman Osborn?
Answer: Cooper's role was a cameo. And often, when well-known or well-respected actors appear in surprise cameo roles like this, they go uncredited. Usually to either try to maintain the element of surprise, or try not to overshadow the rest of the cast.
Answer: Peter could have webbed him up and called the police anonymously.
MasterOfAll
Very likely. However, there was a deleted scene in which Peter, out of anger over Gwen's death, almost beats Harry to death.
Yes. We also see Goblin getting knocked out when all hell breaks loose, and the gears all break apart. Chances are, Peter just webbed him up. (Although, as the other response says, he also got beaten up in a deleted scene.)
TedStixon