A few weeks ago here — here, in fact — we were talking here about how the Monty Python TV series made its way onto American television. Here's a relevant relic: A videotape from a pledge break on the PBS station in Dallas. It's from 1975 and it's not complete but it's a rare interview from that era with Terry Jones, Terry Gilliam, Michael Palin and Graham Chapman. As you'll see, it ends abruptly as Terry Jones is about to explain about "Owl Stretching Time," which was an early but rejected name for the series but you might enjoy what comes before…