If you're curious about hippies
movies about hippies:
Taking Woodstock
Alice's Restaurant
And movies where parent(s) were hippies:
My Girl
Flirting with Disaster
The dividing line between them is mostly music and fashion at that particular period of time. Rockers were late 50s/early 60s, Mods mid 60s, and Hippies later 60s. Mods dressed up while Hippies dressed down. Mod and Rockers were mentioned in Hard Days Night, which was a Beatles' film released in '64. I'm guessing "Rockers" is more a British thing. In America Rockers would be called Greasers, but then that term probably came later -- (I'm guessing) the term was popularize by the movie
Grease. An example Mod group would be early era The Who. In the 70s The Jam were Mod revival band. Rockers (I'm guessing) were into early Rock and Roll and Rockabilly wore leather and rode bikes. A good example of Rockabilly singer who wore leather jacket would be Gene Vincent.
The Hippies ethos was basically an extension of the Beat Generation from the 50s. The difference would be Hippies had long hair, dressed down and they favored Folksy music, and Psychedelia/Acid Rock.
The 5th Dimension - Medley: Aquarius/Let the Sunshine In (The Flesh Failures) a song about peace, love and harmony -- says it all. Plus the second part of the song where Joe Osborn tears it up on bass as Billy Davis Jr. goes to church.
The Cowsills - Hair song about the hallmark of hippieness: long hair.
Joni Mitchell - Woodstock song about the concert which was the pinnacle of hippiedom.
Canned Heat - Going up to the Country The song is laid back. It's yearning for a more peaceful rustic life. The singer is doing his best at imitating Skip James. I don't know how anthemic of hippies others would consider this song, but somehow it's the song I identify most with Woodstock, probably from clips about Woodstock.