I think I'm in the vast minority, but I actually liked Barnabas brushing his fangs
For me, it fit in with the Top Of The World montage and with the theme of him adjusting to 21st century life.
The Windex wasn't the greatest, but I would've been up for Mrs. Johnson to come along and quietly clean him up with a sponge or washcloth, as if it was just another normal day at Collinwood.
However, I'm totally with you on the projectile vomiting; in fact, with repeated viewings the whole Angelique/Barnabas confrontation at the end felt a few beats too long and drawn out. I could have also either done without the Carolyn reveal, OR had that aspect be fleshed out a bit better so it didn't seem so clunky.