The Trotters were held to a 2-2 draw by Forest at the Reebok Stadium in their Championship encounter.
"They scored a 35-yarder to start, we had numerous chances in the game and it was a game we should have won," he told Sky Sports News.
"My disappointment is that we have lost a poor second goal from our point of view defensively.
"We had chances in the game, [Lee] Camp has made some great saves, and we've had some wonderful opportunities. That's a game we should be leaving with three points."
Bolton have collected four points from three matches so far in the Championship.