Is 'How I Met Your Mother' REALLY over?

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In a world where cutting to black (The Sopranos) or sending your characters to prison (Seinfeld) passes for a series finale, How I Met Your Mother‘s ender was decidedly bittersweet but complete. While some critics have harshed on this season, the CBS sitcom did a terrific job of tying up all sorts of loose ends (The Mother has a name! The cockamouse lives!) — except one, that is.

“I know a nagging question from the show might be released as a DVD extra and I did shoot it,” says Josh Radnor who plays Ted. (Filming of the series wrapped in early March.) “But I feel I might not have approval to say what it is, so I’m just going to plead the Fifth.”

As Barney would say, “Please!” No? Okay, we’ll fill in the loose ends. EW has learned the scene Radnor referenced will be included on HIMYM‘s season 9 DVD.

Here’s the backstory: HIMYM creators Craig Thomas and Carter Bays are huge pop culture fanatics who have extensively studied TV series finales. (Cheers is a particular favorite.) Last summer on the HIMYM set, Thomas shared that the duo was thinking of holding back one vital piece of info: “There may be a few mysteries you think you’ve seen the last of, but there might be a little something later,” he says. “Without giving too much away, we toyed around with creating a little video to be released sometime after the series finale to sort of pay off one last little thing.”

What’s that one last little thing? You’ll have to pick up the DVD when it comes out this fall to find out. Aside from that, Bays and Carter are working on a potential HIMYM spin-off, How I Met Your Dad, which will chronicle the journey of Sally (Greta Gerwig) as she dumps her first husband and searches for her second, the father of her kids. CBS will decide in May whether the pilot goes to series.

In the meantime, what did you think of the HIMYM finale? And what lingering mystery do you think the creators “forgot” to solve?