PG | 1h 33min | Drama, Mystery, Comedy | 10 February 1977 (USA) At about the halfway point in “The Late Show,” Margo (Lily Tomlin) suggests to Ira (Art Carney) that they form a business partnership akin to that of “Nick and Nora.” Ira doesn’t get the reference and Margo clarifies it by saying they were the lead characters in “The Thin…