Hi Helen
no.6 does not make any sense. N. was not arrested in the Winter Palace nor was he arrested by the Bolsheviks [although they did later murder him he was arrested by the Provisional government, was he not ?]. Who came up with this list?
I think this is a misinterpretation of something that was said in during the behind the scene special features by one of the people involved in the movie. It was said that this particular room was where the monarchy came to an end. It is probably a room where some document was signed or something. But apparently some people intrepreted is as the room where the IF were arrested or murdered. As most of us surely know, IF never lived in that palace. They were arrested at the Alexander Palace 15 kilometers away from S. Petersburg and later murdered in Siberia.
BTW, for people who have just seen the movie at a theater and none of the trailers or special features on the DVD, the movie was indeed shot in one continuous take. The crew had decided that if anything goes wrong during the first 20 minutes they would restart shooting from the very beginning which they ended up doing 4 times. Luckily the fourth time went very smoothly all the way to the end, otherwise they would have run out of the special battery for the camera, which couldn't last that long and also daylight, since during winter a day in S. Petersburg can be as short as 3-4 hours. I guess that's a fair price to pay for the endless "white nights" that you get there in summer.