Dan Harding warned Forest must out the “silly mistakes” if they want to challenge this season.
Stuart Pearce’s side were twice forced to come from behind after Joe Mason and David Wheater pounced on errors in the first half.
Britt Assombalonga was on hand to level on each occasion, but defender Harding reckons Forest should have got more if they had not thrown it away.
“We must stop the silly goals if we want to push on from here,” he said.
“We’re disappointed with the way we conceded and disappointed we did not win the game.
“We went 1-0 down, got back into the game, conceded a silly goal to go 2-1 down and clawed ourselves back again.
“The gaffer, though, was pleased with the character shown to come back and I thought we were unlucky not to go on and win it in the second half.”
Harding was also quick to pay tribute to Forest’s £5m record signing for his goalscoring prowess.
“He’s been brilliant for us and thoroughly deserved his two goals,” he added.
Mason meanwhile was thrilled to bag a goal on “another” debut for Wanderers.
The striker re-joined from Cardiff on Friday for a third loan spell in twelve months.
“It’s good to be back”, he said.
“It was a good start, but a real shame that we let them get back into the game.”