It is. "Sequel" is the word you're looking for. There is. At the end of the episode the crew think they are back in their own reality only to find that they are still trapped in the game. Both episodes therefore play with the concept of what is and isn't reality: in fact its a trope that runs throughout Dwarf, occuring again in series 8 during BITR. This is explored even more heavily in the First two Red Dwarf novels which almost certainly inspired both Back to Reality and Back to Earth - particularly the latter with its actual dilemma about whether the hallucination was preferable. As, I'm sure would Doug Naylor, but as has since become widely acknowledged, his hands were seriously tied as to what he had access to to make this show. he knew he had to set it on contemporary Earth for budgetary reasons and that certain sets, like the Coronation Street one would be available to him. he built a story around what he had and, given BTE's status as essentially a tribute show he probably thought it made good sense to give fans a nostalgic sequel to the episode most regard as the show's creative pique. That he was able to fool so much of the fanbase by essentially using the same trick again just goes to show how well written BTE actually was. Bully for you if you guessed his intentions but the fact remains that a lot of people didn't and were on tenterhooks until the final scene. I'm saddened that Doug probably regards BTE as a failure now thanks to largely ignorant comments accusing it of "laziness" and suchlike. Saddened because its probably destroyed the chance of any further one off specials being made in that style and that's a shame for me because I think they would have been lovely bookends to individual series and allowed for some high-concept plot heavy storytelling in the future that would have improved the show's overall mythos.