I think you'll be ok. It wasn't a huge issue, I'm sure. And if you did well overall, I'm sure it's going to be fine..

Also, maybe you can explain it to the friend's fiance if you're still feeling unsure. I'm sure they'd understand then.
Oh, the last job interview I went on I was doing great with the plant manager. I knew I had the job. He asked me to come in for a 2nd interview with the vice president of the company.
For some reason, this woman totally flustered me. She was jumping from one topic to the next and then she asked me what kind of car I drove (?). I lease every 3 years and had just moved from an explorer sport to an escape. I told her a sport and then said "oh, sorry, it's an escape." Turned bright red and realized that if I'm getting the answer wrong for the kind of car I drive, I'm guessing she's not going to trust me getting
anything right at the job.
Oh well. I'm at the same place I was when I started looking but stayed because they upped my pay (considerably) rather than have me leave.

So it all worked out in the end..
I just remembered, one time I was doing the interviewing and a lady felt the need to let me (and the vp - a man) know that she had canceled her first scheduled interview with us because she had to go to the gynecologist for her yearly pap smear. Yes, she said the words "pap smear" in a job interview. Gross.