Bears offensive coordinator Mike Martz said his line was"remarkably" better in the passing game, but he thinks the unit is "wound up and so tight."
"We made some mistakes I was a little surprised at," Martz said. "Fortunately, you get that out of the way now instead of the opener and get that out of their system.
"I think there's a cohesion now particularly in the passing game. We do a lot of protections where Jay gets a feel for all those protections. We're trying to get all that done in a preseason, a lot more than you might do in a game. So there's some mistakes, more than I would like to have. It's not because of a lack of effort or not knowing what to do. They're jittery yet."
But Martz said his line's pass protection was much better, saying Chris Williams did a "nice job" and that Lance Louis was a "standout."
"I wish I could show you tape of Lance on [Darnell] Dockett," Martz said. "He did a terrific job. Each week that group grows and gets better and better. I was very pleased with the progress, particularly with the protections and that group."
He said the players are practicing fine but not performing as well during games.
"That's where we are. In practice things go well and then the pressure of games does funny things to young players," he said. "They just have to experience that. That's why we put them in those challenges, so they can play through that and that's what's happening right now.
"The progress is good, I'm happy with where they are and obviously we're not where we want to be but we'll be there by the time we open up."