Have you seen The Graduate, the 1967 film for which Simon wrote the song “Mrs. Robinson”? You can read about its status as one of the best American films by going here, although there is no real substitute for the film itself. How do you think the film itself relates to Simon’s reference to DiMaggio?
If you have seen the film, you may be interested in Roger Ebert’s somewhat unconventional re-evaluation of the movie, upon its thirtieth anniversary in 1997.
Here is some information on Joe DiMaggio from The Baseball Page; http://www.usatoday.com/sports/baseball/joed/dimaggio.htmhere is a tribute to DiMaggio written upon his death in 1999.