Familiar characters give Walmart a way to reopen a shopping decision customers may have closed years ago. A couple days ago, I wrote about how Casper suggested Scrooge needed a better mattress. Well, Walmart has decided what he needs is a shopping revelation, delivered by Muppets. I grew up loving them on TV. And now my kids have their own affection for Disney’s version through YouTube, so I got a bang out of Walmart’s two-minute film, A Who Knew Carol. Walton Goggins takes the Scrooge role...