85-year-old Richard Sherman is a character in the Disney holiday release “Saving Mr. Banks” opposite Emma Thompson as Travers and Tom Hanks as Walt Disney.   Jason Schwartzman plays Sherman and B.J. Novak plays Sherman’s brother and songwriting partner, Robert B. Sherman. Schwartzman, who at 33 is two years older than Sherman was in 1961, sings “Feed the Birds” beautifully…