When The bus stops shortly after leaving home you can clearly see that their neighbor is the Stevens house from Bewitched.
During the bus ride to Los Angeles, Keith teases Danny by asking him if he is going to enlist or "split to Canada". Many draftees who wanted to avoid going to Vietnam would cross the border into Canada as a way to avoid the draft.
The title comes form the 1942 comic novel 'See Here, Private Hargrove' by journalist Marion Hargrove about his personal experiences as a soldier.
The surreal skits involving Keith and Danny Partridge are inspired by The Monkees TV show, that often went into various surreal sketches as part of what the main normal plot was about.