Live: Keeping track of your position (button, UTG, etc)
When I played live, I found it much different than online. You had to keep track of the pot amount yourself. You had to know when it was your turn. You had to look for the dealer button. It was more to keep track off.
You want to play more when you are playing late. To help me remember this, once I was BB and SB, I reminded myself that I would be in late position for the next few hands, so wake up. Once those hands passed, I was less alert on marginal hands, since I was then in early or mid position.
After you're the BB and SB, you're in early position. Pay attention for chances to call.