FYI, although I've never looked at showtimes online, my brother and SIL live in SD and are passport holders there. For a year, whenever they went they would plan their time based on the site's times, and when they got there and got the paper schedule, it was *always* different. He finally gave up! Now he just grabs the paper, takes a minute or two to check out the times, and makes up his schedule right then. For brother and SIL, the Pets Rule show is the most important part, so they really really really HATED getting there in time for it, but finding out the time had been changed!
Just a head's up in case it happens to you, too.