 The final fight between Matt Dillon and Jude Bonner takes place  outdoors on location (check out the sunlight), but almost all the  reaction shots of onlookers (including one of director Gunnar  Hellstrom in costume as a "dog soldier" were filmed on a sound stage  in Los Angeles (check out the lighting). Festus also pops up from  behind a huge rock that is seen for the first time when he appears  (and is not around when the scene cuts away to a group shot).