drilled on not having a LOR from ECs

I've been fortunate to have had good interviews. Never had anyone questioned my LOR, until my last interview when the dean called me into his office. He wanted to know who I asked for LORs, so I told him. He then asks me in a suspicious tone as why I didn't get a letter from a ER and another hospital I I volunteered in. Well, I don't know about you guys' experience volunteering in trauma-one ERs, especially in an urban area, but much of what you do is scut and since everyone is so busy you're never under direct supervision; so naturally I didn't bother to worry about a LOR from this experience as well as another experience at a similiar hospial.

He then proceeds to ask me about details from this volunteer experiences. HE THOUGHT I HAD MADE THEM UP OR SOMETHING! I don't know if I went out of line, but I interjected that he was welcommed to phone my contacts from those ECs since my hours had been logged. He didn't stop there, he went on to say that he thought it was weird that I went to school in X but said I worked at Y since they were so far from each other. Turns out he use to live in the area so he thought he had some insider perspective on my application. I was like, it only takes 20-30 minutes on the freeway. In short, I was offended that I'm considering withdrawing my application. I made sure to tell him that he was welcomed to phone my contacts.

Anyone had any similiar experiences?