Doctor Vampire (Eureka)

Couldn't find mentions of this, my apologies if there is already and I've missed it. I'm just watching this disc now. Is anyone knowledgeable on what the difference is between the 'original' and 'restored' audio tracks? Is the latter a revisionist one with different sounds, or just a clean up so it supposedly sounds better? Have to state I'm not happy with the disc having pointless (and therefore distracting) English subtitles on the English dialogue at the start of the film. Literally no need to have these here when the characters are speaking English.