I hate to criticise this episode (!) but was "Planet Rimmer" a planet or a moon? It was referred to as both. And what happened to the other ship after the end of the episode? Is it still out there? Did it get pulled back to its original time? And whether it did or not, wouldn't (any or all of) the Dwarf crew want to stay on that ship with its crew, or offer some of them the chance to move to Red Dwarf?

That's what I was thinking. Lister is supposed to be the last Human Being alive. Every time another human shows up, they die. But this crew seemed to survive. Will they show up again?

What did happen to that ship after the Dwarfers scarped back to Red Dwarf. Did the time wave send back into the past?

Wish they'd told us.