Tenchi Muyo in Love

Some posters that appear in the 1996 movie that is a sequel to the Tenchi Muyo TV series. What makes these posters a bit more interesting is that the story is set at Japan in 1970. Easy Rider, Beatles, and ウィスキー レッド (Whiskey Red) were what I could spot. IMDB points out that there is a reference to the 1987 OVA Black Magic M-66, but the only connection I could find between both animations is that Chisa Yokoyama (Sasami) acted in both.