"She came in and she was like a shot of espresso," the actor says in a special feature on the movie's Blu-ray/DVD release, out on Friday. "She's incredibly energetic and enthusiastic and she had this sense of play and fun, which was incredibly exciting."
And it was a connection that certainly wasn't lost on the film's director, Marc Webb, either.
"There were fireworks," Webb says about seeing Garfield and Stone working together. "She could take Andrew's improvisation and witticisms and one-up him. It was amazing to see them go back and forth, and it really became fun to watch them."
Stone herself comments that it was essential for the relationship between the characters to feel "authentic."
Something the adorable duo clearly conveys in real life, too!