While Wolfhard has become a recent staple in hit genre films and TV shows, thanks in large part to his role as Mike in Netflix’s hit series Stranger Things, Hader is best known for his comedy. After doing an eight-season run on the long-running Saturday Night Live, Hader went on to co-star in hits like Trainwreck and The Mindy Project, and was part of the voice cast for Bob’s Burgers, Finding Dory, Inside Out, and more. The two might have contrasting résumés, but in reality, the actors couldn’t be more similar— neither wanted to be an actor, both are quieter than what you might expect, and both had to quickly learn how to navigate fame as cast members for popular shows. Their similarities, in turn, made matching the older and younger versions of Richie a snap for the pair.
(mild spoilers in the article at GQ)