Season 1, Third from the Sun: loved this one despite a casual viewing, as soon as they reached the final scene I realized what the twist would be and that I hadn’t once thought about it throughout.
Season 1, A World of Difference: another classic, reminds me of the bit from Netflix’s Bandersnatch where the actor becomes aware of the film crew but continues on as if the film were his life. I’m sure Bandersnatch likely got the inspiration for this bit from this episode.
Season 1, A Nice Place to Visit: classic, loved this one