By Olivia Bahou
Updated Jun 13, 2016 @ 3:45 pm
Credit: Dimitrios Kambouris/Getty

Last week, our inner Broadway geek totally fangirled over James Corden’s Broadway-themed Carpool Karaoke on The Late Late Show, and thanks to Broadway and 30 Rock veteran Jane Krakowski, we now know some insider secrets about what really went down while filming the popular segment.

Krakowski, who was nominated for Featured Actress in a Musical for She Loves Me at Sunday night’s Tony Awards, told Yahooexactly how long they rehearsed for the clip: not one minute!

“It’s all improv. Everything you see us saying and doing in the car, none of that’s rehearsed. We did know what songs we would sing, for the most part, but we hadn’t actually sung them together until we were in James Corden’s car,” she said. So how long did it really take to make the segment? “An hour and a half. Max.”

While it may be hard to believe, considering his animated singing and dancing, Corden truly drove through Manhattan during the filming. “We drove around a few blocks in Midtown Manhattan, over and over again. James Corden is really driving—he’s a very good driver!—and we’re all strapped in. And he’s very strict about that,” Krakowski said.

There was one song that we didn’t get to see in the Broadway-themed clip: “There was a Chorus Line medley that we all got really into,” the Unbreakable Kimmy Schmidt star revealed, saying that Corden truly was the perfect host for this year’s Tony Awards. “James Corden knows the lyrics of those show tunes better than I do. He’s truly in love with Broadway,” she said.

There you have it: The segment is really just as magical as we had hoped.