I actually went back to the theater today and saw it in digital to compare, and it was a lot cleaner than the projection, at least to my eyes as an enthusiast. No flickering problems, clean image through and through.
Saw it (in the Hollywood Cinerama theater) in 70mm as well, haven't ever seen a 70mm projected film, but there was some very bad flickering throughout the film, especially apparent in any highlights. I hope this isn't what all 70mm projections look like... perhaps a projector issue? Anyone know about this?