After Cooper goes into the black hole, it becomes a bit of a mess. Also, saw the "twist" that he was the "ghost" coming miles away.
Another question: At the end, Murphy tells Cooper he should go be with Brand and help settle that planet. Wasn't the whole point of "Plan A" that they would ALL go through the wormhole to settle on the new planet? Instead, they are all just hanging out in a space station and leaving Brand alone and isolated, thinking Plan A was a fake, and trying to enact Plan B by herself.
Also, when they went to cryo-sleep the first time in the movie, I half expected them to awaken on that terrible planet of the apes.