Keep in mind that whatever is actually onscreen doesn't necessarily have anything to do with what was recorded on the soundtrack (they sync that sh!t up in post production).
That said, it definitely sounds like an SG (or similar Gibson with humbucker) through a cranked pre-JCM (cleaner) Marshall.
And the SG in the movie if I'm not mistaken was not a 61 re-issue, but a genuine '68 with the vibrola removed (you can see the holes where the old bridge was).
Peace!