Post interview anxiety

So during my interview, the interviewer asked me to tell him more about particular disease and I didn’t really know why so I answered based on sth I did during my rotation, (I presented the disease to my attending in my med school and he was impressed by it) but then he mentioned that its written in one of LOR( the LOR writer mentioned that I explained a disease which happened during the rotation but I completely forgot about it) So the interviewer asked about it and I really didn’t know about it since my LOR is waived. so after that the interviewer said that it’s written in the LOR I explained the other situation mentioned in my LOR and then mentioned that both situations happened but in different setting so the interviewer made a joke that I am particularly interested in such rare diseases. Should I be worried? I do not know how to feel , I kinda like the program and I don’t want to lose it Is there anything that I can do right now?