Is there any way I can make a note in HEM when I mark a hand so if something is not clear from the HH itself I can have a note to remind me what it is I want to check about that hand?
Once I replay the hand my memory usually does this for me. Otherwise just look for the spot that you were unsure on, unless it was from weeks ago it should stand out pretty quickly.
To answer your question though, no I don't think there is.