 During the scene in the study when the family decides Michael  (Al Pacino (qv)) needs to kill Sollozzo and McClusky, Santino  (James Caan (qv)) is seen idly toying with a cane naturally  assumed to belong to the aging Don Vito (Marlon Brando (qv)); in  reality, the cane belonged to Pacino, who had badly injured his leg  while filming Michaels escape from the restaurant after having  killed Sollozzo and McClusky.