Lee Clark did not hide his disappointment after watching his Huddersfield side frustrated by Cambridge.
The League One high-flyers will have to go at it again after holding out for a draw that could easily have been a loss.
Clark said: "I'm happy with the work-rate, commitment and desire but I'm very disappointed with the quality on the ball, our technical side of the game and our crossing.
"The cameras were here for one reason and one reason only - an FA Cup shock. That should set alarm bells ringing straight away.
"I'm not saying they didn't approach it in the right manner. What I am saying is we didn't do the right things with the ball. We've got to question why and I've got to question myself as well.
"I'd have rather won the game but I'm glad because we could have been out."