I've only ever seen the Brannagh, but it left me wondering whether Horatio wasn't an agent provocateur for Norway, goading the rest of the court into killing each other off and leaving a convenient power vacuum.

Oh, and what I've heard about the original saga version is pretty interesting (IIRC, Hamlet does go to England and has a bunch of adventures there; marrys a Scottish warrior queen who comes back and helps him rescue Ophelia and burn down Elsinore; then the three off them go off and live happily ever after until the next revenge plot breaks out.)