Assistant coach Luke Walton is Warriors' know-it-all on CavsHead coach Steve Kerr said he's spent very little time looking at the Eastern Conference finals, where Cleveland holds a 3-0 lead over Atlanta.[...] assistant coach Luke Walton admits to paying "a lot" of attention.He was the advance scout of the Cavaliers during the regular season and would be the coach leading the film session if the Warriors do, indeed, face the Cavaliers."In the regular season, the advance scout watches the last five games of the team we're playing, to get a glimpse of how that team is playing at a particular moment," Walton said.[...] among the teams Walton drew were the Lakers (his former team), the Knicks (who are running the triangle offense he played in), and Cavaliers — with whom he spent the final year of his career.Before each series, the Warriors coaching staff room has pristine, clean white boards on all its walls.