 For approximately three weeks Robert Zemeckis (qv) would fly to  L.A. after his days filming of the train climax of  _Back to the Future Part III (1990)_ (qv) to approve the sound dub  that Bob Gale (qv) had been supervising of  _Back to the Future Part II (1989)_ (qv). He would then get up at  4:30am the next morning to fly back to the Northern California set  to continue with his filming for that day.