The movie "Ferris Bueller's Day Off" was released on June 11, 1986. The ballgame then must have been filmed either real early in the 1986 season or sometime during 1985. Looking at game logs from those seasons, we see that there was no game in 1986 in which Lee Smith (#46) faced the Braves at Wrigley Field. There were four such games in '85, though Smith left the Braves hitless in one of those. Of the remaining three games, it isn't hard to find the game we're looking for.