In the last scene of The Inquisitor, Lister tries to joke with Kryten by saying "I can give you 15" and holding a severed hand in between his own. The hand was from the replacement Kryten (after he was blown up) who emerged along with the replacement Lister after they were banished from history. When Lister destroyed the Inquisitor he also wiped all effects from his actions whilst on red dwarf, meaning the Cat and Rimmer came back to life and everything that had happened was erased. If this is so how could he still have the severed hand as it to would of been erased from existence?