John Mulaney opened his Saturday Night Live monologue last night by addressing one of the many major life events he’s undergone in the past year: his stint in rehab in December of 2020. Following an intervention with six friends in person and six on Zoom (“if you’re so worried about me, how come you didn’t fly in?”), Mulaney checked into a two-month stay at a treatment facility, and noted that he was in rehab when the insurrection happened (“wouldn’t have happened on my watch!”) The monologue’s longest bit centered on Mulaney’s break-up texts with his drug dealer, a tightly structured three minutes that ends with Mulaney’s observation that he might be “the first drug addict to turn an innocent man into a drug…