Detroit Lions tight end T.J. Hockenson, left, runs past Minnesota Vikings cornerback Mackensie Alexander during the second half on Oct. 10 in Minneapolis. (AP file photo)

DETROIT — Dan Campbell doesn’t like watching film when he’s angry.

That’s why the Detroit Lions coach took some time before attempting to grade his 0-6 team’s performance in Sunday’s 34-11 loss to the Cincinnati Bengals.

“It took a minute to step away from things and just calm down,” he said Monday. “You can’t let your emotions play into it as you grade the tape. You have to look at it with open eyes and somewhat of a clean slate.

“You always need to find the positives and build from those.”

Campbell did find some bright spots: He was pleased with the way his young defense contained Joe Burrow and Joe Mixon in the first half. But he also saw a lot of major mistakes the Lions couldn’t overcome.

Lions head coach Dan Campbell adjusts his cap as he speaks to the media after a game against the Baltimore Ravens in Detroit on Sept. 26. (AP file photo)

“It’s OK for me to say we’re doing this well and we’re not doing this well, but that’s irrelevant until we’re able to clean up the missed assignments and penalties,” he said. “That’s just shooting yourself in the foot, which means we don’t have a leg to stand on until we clean them up.”

Lions wide receiver Kalif Raymond agreed with his coach.

“It is always one thing here and one thing there,” he said, “We need to get on the same page and clean up all these little details. That’s generally all it is.”

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WHAT’S WORKING

TE T.J. Hockenson has been the one player able to give the Lions a chance to complete a pass for more than 6 yards. His 33-yard catch Sunday was Detroit’s only play longer than 15 yards. Jared Goff missed him on what would’ve been a 38-yard TD.

Meanwhile, the wide receivers only had three catches for 22 yards before the Bengals switched to a prevent defense with a 27-0 lead.