Casting call: James Garner agrees to return to series TV on "Man of the People," an NBC show due to debut next fall . . . Tim Dalton signs for the title role in Mario Puzo's long-awaited "Christopher Columbus: The Discovery," due for release on Oct. 12, 1992, 500th anniversary of Columbus' landing in the Western hemisphere . . . Keanu Reeves and Alex Winter have finished filming on "Bill & Ted's Bogus Journey," sequel to the 1989 hit "Bill & Ted's Excellent Adventure."