As for the hand thing with Dumbles...well that was just plain odd in the movie cause there was no explanation for it at all.

Also true. They really cut a lot of the Horcrux information out, the movie took too long just to let us know about Horcruxes but didn't get as far as informing us on them. That area really has me worried for the last story since they're going to have to back up a lot to have the story make sense.

Sure in the book Dumbles was dodgy about what was up with his hand but I think he did eventually explain it (if not the whole story) whereas in the movie...he really never did.