Yeah, this is super important. I've interviewed someone before who was actually pretty well qualified, but through interviewing him, it was clear that he was actually just shopping for an offer to use as leverage against his current employer, and he had no intention of working with us.

For example, if a job would involve relocating across country, you'd better be asking questions about the area, or if you are already familiar with the area, make that obvious. At the very least, ask questions about what a normal day is like, and stuff like that.

I think I made the mistake as a fresh grad of not asking some of those questions because I was desperate for a job, and I didn't want to appear "picky", but I'm sure I just gave the impression that I wasn't serious about it. From their perspective, they probably thought "this kid doesn't want to move across the country, they are just trying to get experience interviewing".