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human
[Spider-Man 2002] Was the Green Goblin always in control over Norman Osborn?

It's pretty clear that Norman's procedure made him lose his sanity and he developed the malicious Goblin persona. The movie gives plenty of screentime for both personalities. There are some scenes after his procedure where Norman is "in control", where he is the dominant personality and not the Goblin. Or so it seems.

The final fight scene has a lot of interesting implications. I'm referring to the part where Norman takes off the mask and pleads for Peter to stop. However, he's also setting up the glider with the controls on his wrist. This means that the Goblin can be in charge while pretending to be normal Mr. Osborn. That opens the door to a compelling theory that perhaps Norman's own personality "died" in the procedure leaving only the Goblin. Some moments like his vicious outburst at the conference meeting support this.

Am I just reading too much into it? Is it a similar situation to Banner and the Hulk? Is Norman "just insane" or is it the split personality problem that's a real thing? Any major differences from the comics?

(Absolutely no discussion on a certain newer film of course.)
gpt
In the Raimiverse, Norman genuinely has a split personality. We see him arguing with the Goblin at several points in both Spider-Man 1 and upon his return in No Way Home. There was no one there for him to "perform" as Norman for either time. >!In No Way Home we see further proof of this as MCU!Peter's Spider-Sense starts going off the moment the Goblin resurfaces but is still pretending to be Norman.!<

With that said, the Goblin knew how to pretend to be Norman, and during his final battle with Spider-Man he was doing exactly that, in order to catch Peter off guard and run him through with his glider. After he had impaled himself instead, however, it was Norman that asked Peter not to tell Harry what he had become.