about three nights ago I was dreaming and at some point I felt my face and it was smooth, clean shaven. This caused me to realize that I was dreaming, as I haven’t shave in about a week. Is this common, to have a reality check by accident? Especially when it’s a temporary thing (my face being clean shaven most of the time). I just found it odd that I would make a connection to how I was groomed at the time.
It’s happened a few times to me. Once I happened to push my hand against a window and it was soft and I realised I was dreaming 
Not sure if it’s common or not for others, but it’s very uncommon for me atleast. But what is more common is that I just relise that I’m dreaming without even doing any RC at all.
Well, it’s not really a ‘true’ RC as you didn’t do it to check if you were dreaming - you just did it and noticed you were dreaming. You could however, use this as a RC (check how clean shaven you are everynow and then and compare it to the last time you shaved).
Still, congrats 
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I did that kind of thing last night.
i was staring in the mirror for a long time. I noticed I had a moustache. (ive never had a moustache in my life) I stared for a long time before concluding that it was normal. Fool!
SILD = Shave Induced Lucid Dream
Terminologically nitpicky people call such things “dream signs”. 