Chicago Tribune theater critic Chris Jones interviews playwright Tracy Letts (“August: Osage County”) and lead actor Michael McKean (“Laverne and Shirley”, “Saturday Night Live”, “This is Spinal Tap”) about “Superior Donuts”, Letts’ new play premiering at Chicago’s Steppenwolf Theater. Letts’ 2007 play “August: Osage County” won the Pultizer Prize and Tony Award in 2008.