To be honest (I know its gonna step on some toes) but I always thought that RD used a Laugh Track. The laughs always seemed very Generic and plain, most "Filmed before a live studio Audience" shows that I have seen normally have different types of laughter for different things -- you can tell its real because each laugh isn't a cookie cutter version of another. I mean, maybe it is different in the US but "Live Audiences" normally do more than just laugh-- taking The Cosby Show, Married With Children, or Roseanne for example -- people would hoot, clap, "OHHH!", and make all kinds of different and unique noises sometimes just one person laughing. I never heard anything like that on Red Dwarf. Each laugh, in different lengths, seemed like the exact same as all the others.