GLENDALE, Ariz.—Turnovers, crazy plays, penalties, special teams breakdowns.

It all added up to a loss Sunday for the Dallas Cowboys, who fell 30-24 to the Arizona Cardinals, their second defeat in three weeks.

After Sunday’s game, it became increasingly clear that the Cowboys are not the dominating team many expected them to be.

“This season isn’t going to go straight down this narrow path and be a nice and cozy Sunday drive,” Dallas quarterback Tony Romo said.

Never before had an NFL team started a game with a kickoff return for a score, then e...

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