Five easy Pieces

Arnold Schwarzenegger is back in theaters in full-on android mode, but your best bets this weekend may be three fine films on home video — two from this year, the other a golden oldie.

Of all the eras in Hollywood history, the decade that stretched from 1969 to 1979 was perhaps the most daring, a time of experimental masterpieces that shocked audiences into seeing the world in a different way. In the era's edgy eloquence, Karen Black portrayed quirky women who found themselves in…