He also recalled being "wowed" the last time they met at the 2016 Desert Trip festival
"He wasn’t a disappointment at all"
Mescal is set to play the Beatles icon in Sam Mendes’ upcoming four film series about the Fab Four
"I don’t think they want to know," she said. "I think they want to create something that’s completely different"
The Beatles used the building as a rehearsal studio in the late '50s and auditioned Pete Best there
The Beatles icon was the musical guest on the season 51 finale of the show last week
Mescal is playing McCartney in Sam Mendes' much-anticipated four-film saga, arriving in April 2028
He also poignantly turned out the lights on the Ed Sullivan Theatre, 62 years after The Beatles' legendary appearance there
Someone's knocking at his door...
He accepted that not taking photos with fans is "radical" in this day and age