Original Commentary

They make a much better couple when they don't actually have to spend time together, which is why their marriage fell apart when they wound up working together directly.

Anyhow, I believe this is the first time she called him Clarence in a long, long time, and names do matter - Terrence

Modern Commentary
She calls him by his first name instead of his last name, here. A pet name or term of endearment would be much too far for her. But this is something.

When he says he'll pay the hotel bill, it's not about the money. She could afford it better than he can. But as you'll later see, she's been stuck cleaning up his messes and paying for his things more than once and would deeply resent it if he tried that again- Terrence