The finger-through-the-hand yielded some strange results for a friend of mine. I told him about LDing one day, and that night he had an LD but the only reality check I told him that he remembered was finger-through-the-hand, so he was just incredibly amazed and did that for the entire dream. He said it went a little something like this:
“So, I was dreaming and then, like, I realized, ‘woah… this is a dream’, and so I did what you said I should try and stuck my finger through my hand, and it felt kind of funny, and I thought, ‘wow! that is awesome! my finger is going through my hand!’ so I just kept doing that for the rest of the dream, just plain amazed.”
Sounds like he may have dreamt he had an LD, but he reported the “feeling” of LDing without me having told him, so I doubt that he was not lucid for that reason.