Most Common Poker Mistakes

Playing a few thousand hands a week in small stakes online, I've noticed these come up over and over:

1. Playing AK, AQ, AJ overagressively after missing the flop. (Continuation bets not withstanding)

2. Overplaying small pocket pairs.

3. Overplaying Ace off-suit w/ weak kicker.

4. Overplaying top midlevel pairs.

5. Not protecting hands (I was super-guilty of this myself until I started reading Sklansky)

Feel free to add to the list or disagree.