The City Ground club lost 1-0 to the Reds through a late Darwin Nunez header.
Forest were left furious as in the lead-up referee Paul Tierney restarted a stoppage by giving the ball to Liverpool, despite the hosts originally having possession.
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The owner is quite upset because they fought," former Premier League referee Mark Clattenburg, who now works for Forest, said.
He has invested a lot of money in the football club and he wants to see results.
He feels another decision has gone against the football club. Quite rightly, he's upset."