John Krasinski better watch this 'Office' mashup of monologue advice before 'SNL'

John Krasinski is about to make his debut as a Saturday Night Live host, and The Office's YouTube channel is trying to make sure he doesn't flub his monologue.

The channel not-so-subtly referenced Krasinski's big night by posting a video titled "How To Prepare For a Monologue," and honestly? It's packed with some good advice....