Yes, I found it VERY confusing, especially since most of the movie is one big fat red herring. It IS a slick production, well acted, but I'd guess 95% of what happens is misdirection. One thing that could help in spotting the flashbacks is the presence of John Hurt. His character dies early in the action; no death scene, just a casual mention by one of the other characters that "Control" was dead. So from that point on, every time you see Hurt, you're watching a flashback. Sometimes he doesn't do anything other than sit at a table, so don't blink. Unfortunately, he can't be in every flashback, but he is in most of them.