At around 16 minutes, Carrie (Leah Remini) asks the barkeeper for a gin & tonic. However, he then puts a glass in front of her and pours Stolichnaya vodka into it.
Carrie tells Doug about her crappy ass ring but in season one they sold her original "crappy ass ring" for thousands of dollars and purchased a new ring. Maybe it is safe to assume that she is upset and jealous about Holly and just lashing out at Doug.