What started as seemingly innocent “Diva Week,” paying tribute to artists known as divas, became one of the most shocking episodes in “Glee” history. Among other twists, Finn Hudson (Cory Monteith) kissed Will Schuester’s (Matthew Morrison) fiancee. “What I thought would be the most difficult scene wasn’t one of the musical numbers, but the kiss between Cory Monteith’s character and Jayma Mays’,” says Emmy nominee Paris Barclay, director of “Diva.” “It was a very delicate moment — had to feel spontaneous and credible. But on the day, after a little discussion and encouragement, Cory and Jayma nailed it.”