Williams caught only one pass in Sunday night's loss to the Giants.
"Yeah it's frustrating. Why is it not frustrating? I feel like I'm a playmaker, I feel like I can change the game, but, you know, it just didn't happen in the passing game," Williams said before Wednesday's practice.
The Cowboys' main deep threat had only four balls thrown his way, but said he was open on several occasions.
"There were a couple of times I was by myself ... on the sidelines, but, you know the quarterback can't see it all, you know, what I mean?" he said. "I don't blame him ... by no means, but we watch film and he sees it and everyone will continue to get better."
The Cowboys got some good news Wednesday when running back Marion Barber returned to the practice field.
Barber injured his leg Sunday, but said he will play against the Carolina Panthers on Monday night.