'Retroman' wrote in with a new shooting location for Spider-Man 3:
It turns out they have set up shop in Santa Clarita, California as well to shoot some scenes (special effects?). The official website of the Santa Clarita Film Office have listed some days they shot last week. The Pirates of the Carribean sequels, War of the Worlds and X-Men 3 are just some of the big-budget movies that also opted to shoot in this area recently. The first Spider-Man shot there as well.
The scooper learned this info here, here and here.
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