That doesn't sound like a lucid dream - lucidity means knowing that you're dreaming while you're dreaming. What you're talking about sounds more like some kind of supercharged dream recall. Like an instant replay or something. I've never had that happen, but it must make dream recall easy!

I HAVE done something kind of similar a few times - where I'll have a dream and then I['ll have another dream right after it that's almost the same, as if I'm trying to really impress the first one in my memory, but the second one ends up being different. I think this happened because I was so intent on remembering dreams - I had done memory mantras and stuff. But it was a problem because then when I woke up it was hard to separate the two dreams, and the second one sometimes confused me about what happened in the 1st.