Frank DiLella goes behind the scenes to check out the newly remodeled Lyric Theater, home to “Harry Potter and the Cursed Child.” Then, the hilarious cast of “The Play That Goes Wrong” shows Frank how to pull off one of their outrageous stunts.

"On Stage" is New York City's premier theater show, seen Saturdays and Sundays at 7:30 p.m. and 10:30 p.m.