Alison Herman When “Barry” began, it was the punchline to a simple setup: a hitman walks into an acting class, then kills in every sense of the term. Co-creator and star Bill Hader was best known for his sketch comedy work on “Saturday Night Live,” while his partner Alec Berg had done stints on “Silicon Valley” and “Curb Your Enthusiasm.” At least to start, “Barry” largely built on those backgrounds, mining humor from its characters’ self-delusion. Hader’s title character wants to express himself, but also hide his true nature; his classmates and teacher all firmly believe they’re undiscovered stars. Even violent criminals like chipper Chechen NoHo Hank (Anthony Carrigan) were largely comic creations.