As it turns out, they weren't really zombies. The just came back from the dead (with the help of George Sanders(!) and some frogs) - invulnerable and with an inclination for violence. And they weren't really much of a biker gang.... more like hippies in hipster clothes. I did like that they had name tags on their clothing (abby, hatchet, chopped meat, etc.).
Overall it was quite entertaining and amusing. But not a zombie film.
...love those mini-skirts!!!