While Philadelphia emerged with a 24-23 victory over Pittsburgh on a late field goal by Alex Henery last Thursday, the Eagles' first-string offense was on the field for just six plays, producing minus-3 yards and no first downs.
"We have a lot of work to do to be an efficient and dynamic offensive football team," Mornhinweg said on the next-to-last day of training camp at Lehigh University.
"It's frustrating when you get two three-and-outs," guard Evan Mathis said. "You always want to have another chance to get out there and try it again, but that's what the next game's for."
The Eagles (No. 8 in the AP Pro32) will take on New England next Monday.
"I think we just need to be consistent in moving the ball," quarterback Michael Vick said. "I think last year, we did a great job of that. Obviously, this year is a new year and we want to make sure that we're all in-tune, we're all on the same page and we'll get better from week to week."
Vick doesn't appear to be the problem. He hasn't missed any practice time despite hitting his thumb on the helmet of center Jason Kelce last week, and Mornhinweg said he is having a "terrific" camp.
"One of the things I was disappointed in was our precision," Mornhinweg said. "You saw the plays that were called were precision-type plays, and although we didn't have many opportunities, several times it wasn't there."
Vick took a sack on a play when he was well-protected, so his pocket awareness is something that can improve.
"He can get better there and he has gotten better over the past couple of years there," Mornhinweg said. "He certainly can get better there. I do believe that if it was a regular-season game - and these are excuses even though everything we do is important and we make no excuses - that he would have done that a little bit differently."
Monday marked the three-year anniversary of Philadelphia and Vick agreeing to a deal, after he had been incarcerated for 21 months.
"He has really learned to play the quarterback position at a really high level," Mornhinweg said. "He is chasing that perfection every day and he wants to become a master at that position as well as being one of the most dynamic players in the game.
"He has come a long way in this system and is generally playing the quarterback position at a high level."
Second-string quarterback Mike Kafka broke his left hand against the Steelers, and he is likely to miss the New England game. Rookie Nick Foles will see more time in his absence. Foles, a third-round draft pick from Arizona, has caught the staff's eye during camp. He's done "just about what I expected him to do," Mornhinweg said.
"He's got an opportunity to be a heck of a quarterback. He's a smart guy. He's picked up the offense at a pretty good rate. You can see his accuracy is good and his timing has been good up to this point."
The Eagles made a switch at left tackle the day after the Pittsburgh game, inserting King Dunlap in place of Demetress Bell, a former Buffalo Bill who was signed as a free agent in the offseason after Pro Bowl standout Jason Peters suffered a torn Achilles tendon.
"I can't say I'm disappointed," Bell said. "It's not what I expected, but it's a coaching thing. It is what it is. It definitely motivates you. I'm looking to be a starter. Until I get back there, I won't be happy."
NOTES: Mornhinweg didn't close the door on Foles being the No. 2 at the start of the regular season. "We'll see. If he continues to develop at a high rate, that will be the key for him." ... After the Patriots' game, Philadelphia will close the preseason against the Browns (Aug. 24) and Jets (Aug. 30).