[Lawman]

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Playing limit you should play a lot tighter and be "in action" less often than in NL because impled pot odds are not as great, so you'll need to show down the best hand more often on average.

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This is an important point often overlooked. Poor/inexperienced limit players play too many hands and go too far with them on the basis that it won't cost much to see the flop or the next card etc. (death by a thousand leaks)

The big difference in NL is that (generally) preflop bets are small relative to stack sizes and that "getting lucky" on the flop can result in you winning a large amount. Another difference is the ability to manipulate pot/bet sizes. You simply can't do that in limit.