ALLEN PARK, Mich. -- It wasn’t at the level of “Omaha,” but Detroit Lions quarterback Matthew Stafford used the line call “Kershaw” in a nod to his friend, Los Angeles Dodgers pitcher Clayton Kershaw.

It was one of a few calls that got picked up by the television feed, along with “Arkansas” and “Bruce.” But "Kershaw" is a unique one, which is why it caught the ear of many watching on television. That calls get picked up is not out of the ordinary -- teams that use code words have this happen -- but sometimes words stand out.

“Same thing it means to Matt,” Lions coach Jim Caldwell said of the call. “Something he’s not going to talk about.”

Matthew Stafford used "Kershaw" as a line call Sunday, but he's keeping the reasons behind hit a mystery. Photo by Al Bello/Getty Images

Caldwell said none of this was done to “get a kick out of” hearing things picked up on audio -- although this has gotten a bunch of attention. It’s more what his players can remember quick and easy without any thinking time.

Not surprisingly, Stafford also wanted nothing to do with explaining the meaning of the call. Kershaw and Stafford were high school baseball and football teammates at Highland Park High School in Dallas before Stafford went to Georgia and Kershaw to pro baseball.

"Oh, let me divulge all my secrets to you," Stafford said. "I'm not telling you s---."

The play the Kershaw line call was picked up on? It ended up as an 8-yard run to the right by Theo Riddick on a drive that ended in a punt.

Was Beckham's hit dirty? Caldwell: "No flag thrown"

Lions linebacker Jarrad Davis was knocked out of Monday night’s win over the New York Giants after being hit from behind by Odell Beckham Jr.

The hit appeared questionable, and Davis grabbed his head right after the hit, was on the ground for a couple of minutes before being helped off and eventually was placed in concussion protocol. Asked about the hit Tuesday, Caldwell initially said he didn’t know what the question was about.

“There was no flag thrown,” Caldwell said. “…I believe that the officials do an outstanding job, actually. When you go into a ball game, players make the most mistakes, coaches make the second-most and then officials make the fewest.

“So they do the best they can.”

Caldwell wouldn’t say whether or not the Lions would send the play to the league to review. He called discussing that possibility “inappropriate” and that the NFL has advised teams against discussing what plays are sent in.

He also wouldn’t answer if Davis remains in concussion protocol a day after taking the hit.

Caldwell won't disclose if/when he gets extension

The Monday Night crew spent some time talking about Caldwell and his lack of a contract extension in the final year of his initial four-year deal with Detroit. Caldwell said he heard there was some buzz about his contract during the television discussion but once again said he doesn’t think about it.

And he made it clear he won’t tell the media if and when he signs an extension.

“No,” Caldwell said, pausing. “That’s the honest truth.”

He went on to say his contract status is not important -- something he’s said often the past few months.