In two Los Angeles scenes in a glass elevator, a logo for consulting company KPMG is clearly visible on a building in the background, in the center of the frame. KPMG was created in 1987, when KMG merged with Peat Marwick. The building, now called KPMG Tower, was constructed in 1983.
While Bobby Riggs is watching television in the Rolls-Royce, he passes channels showing Mary Tyler Moore and Kojak. Both shows were on CBS, but on different days, and neither was in syndication in 1973.