10 Problems Nobody Wants To Admit About The Original Star Wars Trilogy
4. The "I Am Your Father" Thing Is Questionable
Yes, it's the most iconic thing to have ever graced the cinematic medium, and yes, it imbues the trilogy with an added sense of weight and drama, but - when you get down to the nitty gritty - the whole thing doesn't really make any sense at all. And that's really thanks to the fact that George Lucas never planned for Luke and Vader to be related until he embarked upon this movie and decided that it would be much cooler if it turned out that the two were related.
He was right, but there are few issues inherent to this little twist. For one, it changes the first movie entirely, in the sense that it turns out that Obi-Wan just lied to Luke for no good reason about the whereabouts of his father.
At the time that A New Hope was made, of course, Obi-Wan's dialogue was supposed to be sincere, but this twist renders him retrospectively dishonest.
Next up: Darth Vader tries to kill Luke at the end of A New Hope during the Battle of Yavin. Would he not have sensed that he was attempting to murder his son? It all ultimately smells a bit too much like retconning.