 British director Michael Powell (I) (qv) was around quite a lot  while the film was being made (he and editor  Thelma Schoonmaker (qv) married soon afterwards). Nobody was sure  how the film should end. Michael Powell (I) (qv) said "He must  finish up back at work" but this was initially dismissed as too  unlikely and difficult. They tried many other endings, a few were  even filmed. But the only one that everyone felt really worked was  to have Paul finish up back at work just as the new day was  starting.