Sure, he had some minor success with the Beatles-themed I Want to Hold Your Hand, and his Used Cars was a critically-acclaimed cult comedy.
The earlier Zemeckis/Gale/Spielberg movies, like "Used Cars," were noisy but they were at least sassy and offhand, with a pleasant, bargain-basement air.
They love the crassness, obviousness, and manic energy of old TV, and it gives their work (Used Cars, the screenplay of Spielberg's 1941) a uniquely American zip and vulgarity, like the best early-60s rock.
Zemeckis and Gale, the gifted satirists who collaborated on "Used Cars," have cannily chosen the time periods in "Back to the Future," which are funny as much for their similarities (political and materalistic) as their contrasts (music, fashions, language).
The script was turned down by everybody in Hollywood and the creative duo behind the wheel, Robert Zemeckis and Bob Gale, hadn't set the box office on fire with their previous collaboration, Used Cars.
Robert Zemeckis met with such tremendous success in helming the likes of Back to the Future, Who Framed Roger Rabbit and Forrest Gump that it's often easy to overlook the two gems he directed and co-wrote (with Bob Gale) at the beginning of his career.