I noticed that too being a broadcast student, and a bit of an aspect ratio nerd.
The smooth criminal "sliding down the handrail" is 4:3, the rehearsal footage is 16:9 anamorphic, and the (me speculating) dress rehearsal footage elements are 4:3 letterboxed.
The only conclusion I can come to, is that the elements they are putting together come from different sources and were shot differently. I assume the studio footage was shot (or at least given to sony) in 4:3, the months of rehearsal footage was shot correctly in 16:9 (maybe on HDV or something), and the dress rehearsal stuff was shot letterboxed while they were testing the multicam system or something.
Again this is just me speculating, and based on very little evidence from the trailer. I guess we'll find out properly by looking at the movie.
Because it's a documentary, changing aspect ratios can be forgiven, but I just hope i'm wrong, and in fact the dress rehearsal stuff was shot in 16:9 HD anamorphic.
Nonetheless sony will probably crop and upscale things to unify the ratios...Or maybe the footage they used for the trailer was temporary footage at a lower resolution that they referenced before all the elements came in.
Or maybe they just letterboxed and pillarboxed some of the shots to make the trailer more visually engaging.
...Who knows.