This is the first Tom/B'Elanna scene where he shows any kind of interest. He's jealous because of "Freddy Bristow" (I'm counting the crew memebers, people) and asks her out. She turns him down. Still, it's a moment.
The Doctor also begins his sordid career as an opera singer here. The holodeck even programs him with a toupee.
It's like singing with a computer!
-The Doctor's holographic opera singing partner