 The Krakow ghetto "liquidation" scene was only a page of action in  the script, but Steven Spielberg (I) (qv) turned it into 20 pages  and 20 minutes of screen action "based on living witness testimony".  For example, the scene in which the young man escapes capture by  German soldiers by telling them he was ordered to clear the luggage  from the street was taken directly from a survivors story.