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A Redskins source said the NFL admitted that officials erred in picking up a penalty flag that would’ve negated a first-quarter punt return for a touchdown by the Eagles’ DeSean Jackson.

The officials apparently were confused over which No. 50, Washington’s Khary Campbell or Philadelphia’s Tank Daniels, committed an illegal block in the back. It was Daniels.

Fourth-quarter prowess

The Redskins have outscored opponents 34-10 in the fourth quarter. The 24-point advantage ranks as a tie for third in the NFL behind Buffalo (45-20) and Tennessee (38-10).

“Necessity,” Zorn said. “We’ve had to make sure we move the ball in the fourth quarter, we’ve had to score in the fourth quarter and we’ve had to maintain ball control in the fourth quarter.”

In contrast, the lowly Rams have been battered 56-10 in the final period.

Respect for Hall

The Rams’ Dante Hall, who returned 10 kicks for touchdowns from 2002 to 2005, ranks 20th in punt return average (8.2 yard average) and 31st in kickoff return average (20.8).

Still, Rock Cartwright, a standout on the Redskins’ special teams, said he’s still dangerous.

“He’s an ‘X’ factor that can bust one at any time,” Cartwright said of Hall, who has just two touchdowns the past two-plus seasons. “We definitely have to get good punts, have to cover well and just play physical.”

• Staff writer Ryan O’Halloran contributed to this article.