Possibly a dream sign?

I am not sure if this would technically be considered a dream sign or not, but i have noticed that the few lucids i have had have been sparked by looking at something, than looking away and looking back to find that it has changed, and than doing a reality check. These things that change have varied from text, to parts of buildings completely changing. Could this be a dream sign??

More like a normal unstable nature of the dream.
Changing texts and buildings is an RC by itself.
Congratulate yourself that you manage to notice these obvious details that most people (including me) overlooked for some reasons.

Ok, I usually notice those details after i try to WBTB method which i have only attemped a few times.