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1. Surprisingly, this is the shortest of the Potter films so far--only about 2 hours 15 minutes. They seem to have accomplished this by omitting about 50% of the book! Nonetheless, they have kept the Harry-centered part of the story, and have done so faithfully.
2. Lots of fine newcomers in the cast along with the returning favorites. Imelda Staunton is just wonderful as Dolores Umbridge: a perfect pink fascist.
Helena Bonham Carter is delightfully campy as Bellatrix LeStrange, while I must single out the outstanding performance of the young girl who portrays Luna Lovegood (her name escapes me).3. Special FX are up to the standard we have come to expect, with the thestrals being especially well realized. Think of the depiction of the Horses of the Apocalypse on gothic cathedrals and you get the idea.
4. All in all I would say that this is the best so far of the HP films, with the caveat that anyone who hasn't seen the previous films (or read the books!) would find following the plot tough going.
I'm still in the middle of "Deathly Hallows", so I can't comment on that yet.

). The "Hidden Secrets" documentary is really just a review of the films up to this point, and I don't especially care for the "DIY Editing" feature.