1) Failing to keep the plane straight during takeoff run.
2) Climbing out too steep.
3) Not maintaining a constant altitude while turning.
4) Turns that aren't smooth, too sharp, etc.
5) Forgetting that there is a left stick.
6) Not lining up with the runway during landing approach.
7) Using ailerons instead of rudder to make course corrections when landing.
8) Using the elevator to extend the landing when you realize you're short.
9) Failure to learn the signs that a plane is about to stall, and what to do to avoid it, or recover from it.
I'm sure there are more.
Sorry I'm behind a little I know..I just wanted to point out that these are just the few of the many points that have to be unlearned from a sim. I know, I do them too! I'm a new-bee. I have never flown before; this spring will be my first time out. The Sim has taught me how to take a plane off the ground and how to land it. It gives me an overview of flying, so when I do approach an instructor I can speak intelligently and have an idea of what he is talking about. Sims are a great introduction to flying, they give you, the future pilot, an opportunity to see what its like to fly a model plane. There are a few basic disciplines that are learned from a Sim, how to take off, land, fly (maybe not the ‘right way’) around the pattern and of course have fun. Over all I think Sims are a great STEPPING STONE to flying.