1.) Definitely shot all in game on the 360. (Not counting the wall footage from the teaser trailer of course.)
2.) I don't believe that the plant in question is a Nirnroot. If you look closely you'll see an identical plant slightly further away, and to the right of the screen. It's only visible for the last few frames of that shot, but it's definitely there. I doubt they'd place two Nirnroots so close together...
3.) The woman in the tavern is either a Bosmer or an Altmer. It's pretty much impossible to know for sure. Also I dunno whether anyone noticed, but in that same shot, the barmaid is a Dunmer... Only visible for the first couple of frames.
4.) In the shot with the windmill and the natural cliff outcrop, there are birds flying around. There's also a bird flying above the fort in the background of the troll shot. I hope we can actually kill these birds with projectiles, and that they sometimes land/perch like real birds.
5.) I agree that the water in that cascading shot looks pretty bad, but in some other shots it looks quite good. When the robed man walks through town, there is a mill on the left with some pretty nice water effects. Also in the cave when the player casts a light spell from a staff in his left hand, the waterfall on the right looks quite good IMO. I'm sure Beth will address the animation/texture for rapids though since that seems to be the #1 complaint.
I'm in the process of uploading my own album of snapshots. Source = the high definition trailer from ES.com, snapshots taken in VLC... Should be the absolute highest quality available right now. I'm thinking about anolyzing all 28 of the screens in my album. Would anyone be interested in reading that, or would it fall on "blind eyes"?
I would