How many nominations did Law and Order season 9, episode 20 get?
Law and Order refers to series = 'Law and Order'
SELECT COUNT(T2.award_id) FROM Episode AS T1 INNER JOIN Award AS T2 ON T1.episode_id = T2.episode_id WHERE T2.series = 'Law and Order' AND T1.season = 9 AND T1.episode = 20