Run Run Run sounds more to me like HDH in their embryonic period still developing and searching for that patented HDH sound...not quite there, but well on the way... It was also a case of Bari Sax overload [[either Beans Bowles or more likely Mike Terry) that in their future work cut back on for more tasteful baritone sax fills instead of stepping all over the entire song... I don't see a lot of Spector there, although I have no doubt songwriters and producers listened to a lot of radio back then and certain elements were bound to filter through, knowingly or through a sort of musical osmosis...