"Medium Cool" (1969) is higher budget than "Putney Swope" but not much. It has Peter Bonerz (Bob Newhart's neighbor Jerry) and Peter Boyle in it.
Soundtrack was by Mike Bloomfield, with several songs of the Mothers of Invention dropped in unaccountably.
There is a lot of footage which appears to be filler -- long shots of scenery, crowd scenes, unconnected scenes -- and parts of it were actually shot at the 1968 Democratic Convention riots. It alternates between news footage (some of it real) and movie footage. The story is pretty much incomprehensible.
Not that it matters.
Apparently, editing wasn't invented until the '70s.