I’ve said it before, and here I am saying it again: BBC America is doing itself, and Graham Norton, a disservice by delaying the Saturday telecasts of his talk show outside of prime time. Tonight, with the launch of its new Jonathan Strange & Mr. Norrell series, BBC America is pushing back the start of The Graham Norton Show until 11:15 p.m. ET. And that’s a shame, because the guests this week include, on the same couch, Amy Schumer, Stephen Merchant and Samuel L. Jackson. And Schumer tells a story about Kanye West and Kim Kardashian, and her encounter with them at a red-carpet event, that is positively priceless…