...And some people are masters.
Now, these rules you named are probably straight from the books, right? I'm not going to dispute them or try to prove them wrong, more like expand upon them.
1. Obviously, a novice lying person would attempt to look away. Though, someone who is good at lying can also lie convincingly with his back turned. Also, a timid person who always looks away in every conversation doesn't have to be a liar. That can help too.
2. No comment. Who would've thought!
3. And what if the person trying to lie is somehow more serious than usual? Laughing can give the illusion of a casual conversation. Unless one laughs like a crazy clown.
4. This quick thinking, though it can be taught, is usually something that comes naturally when one is not tense.
5. Often... not always. But that's what it says, I suppose.
My rule of thumb: If you want to lie, you must believe your own words.
You must forget about the fact that you're lying and be convinced that you're telling the truth. For some, as easily said as done, for others... not so much.
I honestly hate being good at it, because it's like constantly having something you shouldn't use. I can't think of a good example.
But what's the point of lying if there is not harm in telling the truth?