Two Blunders in One Hand

I was recently told about a hand from an amateur poker player that illustrates two detrimental mistakes that many amateur players make on a regular basis.

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In a $1/$3 cash game, a tight, solid player raised to $20 out of his $800 effective from third position at a nine-handed table. An unknown player in the cutoff called. Our Hero decided to call with 9d-8h from the big blind.