To answer to the question: Williams extending his hands away from his body was impressive (no body catching), then dragging his feet. Seems like such things usually happen to Dallas when their defense has a team to 3rd and 20. Nice to be on the other side.
Romo scrambling was not that unusual. He is going to have to keep doing that until they change the passing philosophy.
But getting to the 3rd and 20 was just sophomoric and regressive. The penalty that caused first and 20 aside, the team had spent a great deal of time all during the game up until the second half methodically trying to avoid 3rd and long. They were using runs or high percentage short passes to get chunks of yards (the use of Dunbar a check down as opposed to a hot read underneath is still a problem in strategy. Romo is going to be hurt bad if he has to continually wait as long as he has to before getting rid of the ball. Notice that the RBs have very limited routes, they just kind of stand there following their blocking or play action on pass plays).
When they were at 2nd and 17 earlier on the first drive of the second half and went to the expected and repetitive panic offense that Garrett has plagued the team with for years, they put the game and Romo at risk. It was a huge regression to last year. If they ran the ball or just got 5 yards back they could have had a more manageable 3rd down and 9 or something. Murray ended up getting 14 yards but fell short.
They spent a great deal of the game using the talent wisely by pounding the ball, passing to the RBs in space and using the TEs. What did not work and continues to be a weakness is the distance passing plays. The WRs should not have to fight into contested throws as often as they do. It means they are not open. And it means that the play was not deceptive or effective enough by itself.