Yeah, if you're not making a documentary, you have to have some drama, conflict. Or exaggerate it. And if your movie is a "based on a true story" sort of thing, you have to take some license.
Another Tom Hanks, "true story" example was Apollo 13. I mean we all knew they made it back, but thrust into the climax of the movie, you weren't really sure. They played up the conflicts between the flight crew, that never really happened. Rookie Jack Swigart wasn't the bumbling greenhorn they made him out to be. Few astronauts that make it to flight status are.
He had as many airplain flight and simulator hours as Mattingly and the rest of them. That's one of the jobs of the back up crew. But if they don't take some literary licenses, the movie will suck and you might as well have made a documentary.
Look for the Helpers. You will always find people who are helping.
-Mr. Rogers' Mom