HBO's 'Girls': Secrets of the Lena Dunham-created show

"The inclusion of Café Grumpy came straight out of Dunham's personal experience in Greenpoint. It also helped that the coffee shop is located right next to Broadway Stages, a production studio where "Royal Pains," "Blue Bloods" and "The Good Wife" are taped. "It's the best coffee in the city, probably. Plus, at the time, we were shooting in Greenpoint and that was the place to go for coffee," Munn said.

As a popular filming location, the shop wasn't aware its name was going to be featured in "Girls." "We didn't even realize we were going to be a character on the show," owner Caroline Bell said."

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