Lane Community College in Eugene served as the location for the film. The new campus was in the final stages of construction at the time of production. This allowed the film crew to easily simulate the occupation of offices and buildings by protesters without interfering with actual campus life. Some pyrotechnic effects were used, including one that used black powder and petroleum that blackened an exterior wall and startled the cast and crew. A technician apologized for overdoing the effect (an understatement). Many local people were involved, including a few hand-picked for stunt work.
This uni campus set picture debuted theatrically in the same 1970 year as The Kent State University Shootings (aka The May 4 Massacre aka The Kent State Massacre aka The Kent State University Massacre) in Kent, Ohio, USA.
The Californian university campus seen in the movie was a community college in the American state of Oregon in the USA with the picture not being filmed in California but in Eugene, Lane County, Oregon.