Dan Campbell knows Thursday’s loss to the Green Bay Packers was a missed opportunity in more ways than one, but along with the disappointment of losing comes the aggravation of avoidable mental errors.

Speaking with reporters on Saturday, the Detroit Lions coach touched on a pair of defensive miscues – ones that have been uncharacteristic of the Lions’ defense under Kelvin Sheppard.

The first incident occurred during the sixth play of Green Bay’s opening drive in the first quarter. The Packers had the ball, third-and-1 at Detroit’s 40-yard line. On the play, the Lions only had 10 players on the field.

As a result, there was one less defender in the box as Packers running back Josh Jacobs ran up the middle for 13 yards, one of his more impressive runs of the afternoon, and for obvious reasons.

Jacobs’ run helped set up Packers kicker Brandon McManus’ 45-yard field goal to give Green Bay a 3-0 lead out of the gate.

The next blunder occurred with 3:01 left in the second quarter, with the Packers having the ball on Detroit’s 8-yard line. Officials flagged the Lions for having too many men on the field, as 12 players were out there. Two plays later, Packers quarterback Jordan Love connected with receiver Romeo Doubs on an eight-yard TD to give Green Bay a 17-7 lead.

“Yeah, it’s frustrating. Those are the things that get you beat,” Campbell said. “Those are the little things that we have complete control of that have nothing to do with talent. That’s part of being disciplined. And there again, I’m totally responsible for those. That’s on my watch.”

Campbell taking the blame for the mistakes is expected, as the errors appeared to occur when the Lions were rotating defensive backs in and out of the game. Throughout Thursday’s game, they worked the returning Terrion Arnold – who was in his first game back from concussion protocol – Amik Robertson and Rock Ya-Sin into the rotation.

“It’s not OK that we have 10 or 12 or we’re lined up wrong,” Campbell said. “I’m responsible for all of it. We have not been detailed enough. And the discipline — it’s something I plan on hitting head-on.”

Campbell has discussed throughout the season that the Lions need to clean things up after both their wins and losses. With five games remaining in the season and currently on the outside looking in, time is ticking on their opportunities to turn things around.

The Lions will have their first shot to do so and get back in the win column when they host the Dallas Cowboys for Thursday Night Football next week at Ford Field.