What are the most common, easily exploitable NL cash game mistakes?

[EZgo]

Forgot to mention, that I love to pay attention to who will limp then call a raise OOP, and their ensuing post-flop behaviour.

[Stake Monster]

- Not paying enough attention to the tendencies of the other players

[thoronas]

I only played there one weekend but I gotta say at both the Mirage and Caesar's Palace I was amazed at how weak tight the 1/2 tables were. Especially Caesar's Palace.