Continuity mistake: When Julia is entering her office building she is wearing a black skirt and pantyhose. When she is inside opening the office door for her sex addiction group she is wearing black leather pants under the skirt. Then a few shots later she has pantyhose on again.
Factual error: When Nick, Kurt, and Dale are in Rex's closet, Dale appears to be turning on the gas. What he is turning is actually the screw to secure the regulator onto the gas cylinder. You can see the valve to release the gas at the top end of the cylinder.
Julia Harris: Have you ever done it in a dentist's chair? Nick Hendricks: Well, you go there, and I'll just go to the men's room for a minute. Julia Harris: You're quite welcome to do that on me. Nick Hendricks: Actually, it's...uh... [holds up two fingers]. Julia Harris: And?