 There is an alternate ending for episode 6.6: "Out Of Time". The original  version shows the crew sitting around the main table celebrating their  victory over destroying their future selves. They toast to it with  celebratory margaritas. They instantly spit it all out and Lister says, with  disgust "These arent margaritas, thats Urine Recycle!" This ending was  later changed to the present one as the writers felt they couldnt go  anywhere without a cliffhanger.