SERIES PREMIERE: Okay, this show is really, really weird. Which I mean, of course, as a compliment. It’s a bit like another IFC meta series, Documentary Showcase, which claims to be a long-standing TV series and presents closely designed parodies of actual nonfiction films. Sherman’s Showcase does that for a Soul Train type variety and dance show, but also takes an SCTV approach, expanding its parody approach to includes commercials,