Maybe you were meant to watch this and future films back to back? Besides Star Wars did exactly the same thing. In A New Hope, Luke was given this awesome weapon and told about this "Force" and this grand legacy of Jedi Knights he's part of. Yet, that was barely explored in that film by itself. He uses a lightsaber once for barely 5 minutes and the force only in the Death Star trench run. When Empire Strikes Back happened along with Return of the Jedi we only see Luke really embrace his legacy and the lightsaber as well as using the force to the best of his ability. Bottom line is, Luke's story fleshed out in the sequels. Not everybody has to follow "some set of rules" when it comes to coming up with how the movie goes. Some things are just too big to be explored in one movie. As for that scene of the next minute being at Kent Farm, anybody could tell considerable time has passed.