I can't help you out with this in regards to Home Health because I can't hire a nurse unless she has a year's experience. Since I have done hundreds of interviews I can tell you what issues are problems for me if I were to interview you.
1. As someone said, know about the company you are interviewing for.
2. Don't appear overanxious. If you appear desperate, it makes me wonder why nobody else will hire you.
3. If you left another company, don't badmouth the Supervisor. I'm liable to tick you off also at some point and it will make me wonder what you will say about me to another interviewer.
4. If you leave another job because of issues w/ the company, supervisor etc, I want to hear that you followed the appropriate chain of command to try to fix the problem. If you tell me you walked off the job without notice or without trying to solve the problem, I will not hire you.
5. If you have a tongue stud, take it out. If I can't understand you speak or if you twirl that darned thing throughout the entire interview, it won't go well.
6. Look in the mirror before you leave the home. If your clothes are inside out, dirty, have holes in the knees, your nipples are showing through your shear shirt, or I can see the upper 1/4 of your thighs and what color underwear you are wearing, I also won't hire you. (I have seen all of this!)
7. I understand that you are nervous but listen to my questions and only answer what I ask. Don't fill in any gaps in conversation with nervous, unnecessary comments. That is when applicants tell me what I really want to know but can't ask. (you have a child who gives you daily problems and the principal calls you to the school daily is not something you want me to know)
8. Let me get a word in edgewise. Let me be the one to decide if you are appropriate for hire. Don't continually tell me all of your attributes unless I ask for them. I recently interviewed someone who actually conducted the entire interview herself, I hardly said a word no matter how hard I tried!
9. Be truthful. I will be conducting background checks. If you were arrested for something stupid you did 10 yrs ago, I may still be able to hire you if you tell me about it. But if you lie and say you were never bonded or arrested and it shows up later, I won't hire you... not because of the conviction, but because you lied.
That's all I have time for now. Hope this helps. I'll post more if I think of anything else later.