When Kryten is rebooting Rimmer's hologrammatic form, the computer display gives Rimmer's species as 'Homo sapien'. It should be 'Homo sapiens'.
Lister admits to the psiren/Pete Tranter's Sister that he hasn't had sex for over three million years (or four ice ages). He's forgetting his encounter with Deb Lister from the parallel universe in season 2 which resulted in him getting pregnant.