So many explain that's I think it needs its own thread. Not all of these are necessarily outright plot holes, some are mysteries that went unanswered. Where did the Rejuvination Shower come from. Kryten just says it was "in transit", what does that mean? Why does Kryten have the Returner Remote in his hand? He didn't know he was going to get taken anywhere he needed to return from. Given it zapped them to 1st century Britain by accident, why did it come with a "Returner Remote"? It wasn't supposed to take them anywhere they needed to return from. If "Returner Remote" means "Return to your previous state of un-juvination", why would that be a special remote, why wouldn't that just be the control panel. If you wanted to "return" to your previous state, you'd just get in the shower. How would it work by remote. If it works by remote then why not have the initial rejuvination work by remote too. It doesn't make sense, surely you're in the shower for it to Rejuvinate / Unjuvinate you. And why would the remote have such an astronomical range. The time-and-space-travel mishap was presumably to do with "rejuvinating" them back through their ancestry, ie go right back beyond your youth to your fertilisation to your parents, grandparents, etc. But Cat is about a million generations out from the other three. Ancestrally he's three million years older. So if it took the other three roughly 2130 years through their ancestry, about 60-odd (human) generations, Cat would still be on Red Dwarf. Cats breed much faster, and his genealogy is way out from ther others. Kryten is also two centuries out from Lister and Rimmer. But maybe his part-organic brain was similarly born in the mid-22nd century? Lister is presumably mixed-race like Craig Charles is, so Lister could have ended up in Africa or wherever else his ancestors were then. But conceivably part of his ancestry may line up with Rimmer's and Kryten's part-brain. Or is it nothing to do with genealogy? Similarly, Rimmer and Kryten are inorganic. I suppose I can offer a fix for this myself and say Kryten's brain is part-organic, although isn't it a couple of centuries out from Lister? I don't know how it worked on a hologram. Did it read his DNA code in his light-bee and know where to send him? How does Kryten know they're in Britain in 23 AD without the psi-scan? He just wiggles his head and knows. What did they do for food and water walking across Eurasia for six months? We see them buy the lemons, with what currency? Should we infer that they got jobs to get the right currency to buy food for their journey? Wouldn't it then have taken a lot longer than six months? Why does everyone in 1st century India speak modern English, which didn't exist?