Jimmy Fallon, the beloved host of “The Tonight Show,” is swapping his late-night desk for the Broadway stage. This week, he made his debut in the new comedy “All In,” and let’s just say, even seasoned performers get the jitters.

“When you have too much time to think about it, you overthink it,” Fallon admitted after his first performance at Manhattan’s Hudson Theater. The show, a series of short comedic sketches written by Simon Rich and directed by Alex Timbers, features a rotating cast of big names. On Tuesday night, Fallon shared