The X-Men film franchise has generally been well received by fans, but has become more and more plagued with continuity errors since beginning to jump around the timeline. In X-Men, Xavier says that he and Magneto built Cerebro, but in X-Men: First Class Beast has built the machine before they ever show up. Emma Frost is introduced as a teenager in X-Men: Origins Wolverine, and then again as a young woman in X-Men: First Class. In X-Men: The Last Stand, Moira MacTaggert is a middle-aged medical scientist, but in First Class she's a young CIA agent. Is there a solution for these inconsistencies? Director Bryan Singer is hoping people will just forget about them. "Some things you let go," Singer tells SciFi Now. "In X-Men 3 Bolivar Trask was an African-American guy, in X-Men 1 I personally wrote the line that of course I now regret: 'When I was 17, I met a young man named Erik Lensherr' and then in X-Men: First Class I changed that! Some of these I hope the audience will forget about but for the bulk of it I pay attention to the universe." While most of largest inconsistencies seem to come from the films that were handled by Brett Ratner after Singer left the franchise for a time, Singer does say that those films still count for something. "Not just X-Men 1 and 2," he said, "but also X-Men 3 – I was thrilled to have [Kitty Pryde star] Ellen Page in the movie as character – and even The Wolverine, I try to look at all those." Of course, with the time-travel shenanigans going on in X-Men: Days of Future Past, there's also the possibility of some retroactive continuity being added to iron certain things out. In X-Men: Days of Future Past, the X-Men send Wolverine to the past in a desperate effort to change history and prevent an event that results in doom for both humans and mutants. X-Men: Days of Future Past comes to theaters May 23.