They initially told me the wrong building to go to, leading to quite a bit of confusion, before leaving me waiting outside the correct building, which was locked, for an additional 10 minutes. When I got inside, there was no reception and I was left to sit dumbly until a random, entry-level employee had to leave their cubicle to ask me who I was there for and track them down himself.
When I was finally ready for the interview, the manager left a single sheet of paper on the table and walked out of the conference room. He wanted me to solve a bunch of elementary school-level math problems. This was the single most demeaning thing I have ever experienced in an interview, and I nearly walked out on the spot.
When the manager came back in, it was the generic interview questions (tell me about yourself, strengths/weaknesses) and the generic answers as to what they do. It was fairly clear that the commission standards they were claiming weren't actually real, and I got one of the two managers who interviewed me to admit that half the people in the position made no commission at all, making the math for their standards impossible.
I was actually lied to during the interview regarding who I would be assigned to. One of the managers had just been promoted, had zero prior management experience, and was one of those people you can tell at a glance just doesn't care about or understand people/business enough to manage them. The other (a larger bald man) was actually fantastic, and I accepted the offer solely based on the fact that I knew he actually understood what he was doing. On day one, however, I was under the other, less competent manager, and had all of my fears confirmed.