- Big-Lipped Alligator Moment: Tongue Tied. It's a music video is the cold opening to the episode. No context or anything, just that. It's revealed afterwards that it's a recording of one of the Cat's dreams. (One should note that the description of the video isn't even accurate, the scene has nothing to do with "parallel worlds". Apparently even the BBC don't know what was going on with this.)
- Ear Worm: "Tongue Tied".
- Just Here for Godzilla: Among fans, this is widely known as the episode that features "Tongue Tied"... and has some other stuff about a Mirror Universe, which is generally only remembered for its role in indirectly setting up the Retool for the following season.
- Older Than They Think: Good luck finding any fans who remember that Hattie Hayridge's first actual appearance in the series (albeit playing Hilly rather than Holly) was in this episode, rather than "Backwards", due to "Tongue Tied" so completely overshadowing the actual storyline of the episode for many.
- Values Dissonance: Rimmer's female equivalent actis what would be considered pervy for the time (if done by a man), but downright horrible by today's standards. She comes onto male-Rimmer, grabs him by the thigh, claims he's "begging for it", and, when he turns her down, calls him "frigid". When the Rimmers discover the Listers in bed together, she slut-shames male-Lister right to his face.
YMMV / Red Dwarf Season II Parallel Universe