ARLINGTON, Texas — There is something about AT&T Stadium that agrees with Mike McCarthy.

He won Super Bowl XLV there with the Green Bay Packers and was 4-0 entering his first home opener as the Dallas Cowboys’ head coach on Sunday. He improved to 5-0 after the Cowboys’ 40-39 victory against the Atlanta Falcons that even he could not believe.

“I had one on the other sideline, but it’s not like this,”