Factual error: Considering the brightness of the fusion process, Dr. Octavius has to wear special goggles to be able to see it. Yet no one else in the room is wearing such goggles or seem hurt by watching the whole process, just as at the end of the movie. When welding something, no one can look at the arc that's created, as it would hurt his eyes and burn his retina; presumably, the fusion process would be brighter and more powerful than that, and so should have some kind of damaging effect on everyone's eyesight (except Spider Man's, maybe).

Spider-Man 2 (2004)
1 review
Directed by: Sam Raimi
Starring: Alfred Molina, James Franco, Kirsten Dunst, Tobey Maguire, Rosemary Harris, J.K. Simmons
Your rating
Average rating
(15 votes)
9.8/10. An excellent sequel. I enjoyed it immensely. The story was spot on perfect almost. The weight of the world on Peter's shoulders was handled well here. You can sympathize with him as we've all been there at some point. The villain of Doc Ock is done in an interesting way. He's not out for world domination but for the goal of trying to help mankind, just delusional about it. The whole cast from Maguire and Molina down to Simmons are well done here. They seem to flow perfectly here. I would put it as one of the best superhero movies of all time. Spider Man's the one who made the MCU possible. This is how you do a superhero sequel. Well done and still holds up excellently.
Mr. Ditkovich: If promises were crackers, my daughter would be fat.
Trivia: In the scene where Peter drops his books on the college grounds and bends down to pick them up, a black bag comes by and smacks Peter in the face. The person carrying the bag is director Sam Raimi.
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Answer: Unless there is is a deleted scene to shed light on the issue, then it's not really addressed in the movie. It's possible that Doc Ock and Harry had a second meeting that took place off-screen in which Ock revealed to Harry where his hideout was, but as there's nothing really to go on, it's anyone's guess and it's reasonable to consider it a plot hole.
Phaneron