Get over it. Yea they should've done the rehearsal. Things could have gone better that day, and it's embarrassing to be standing there waiting at the top of the aisle. Yea, they could've taken a little more responsibility for what happened. So what? The dad is not a professional, so you can't hold him to pro standards.
The music got screwed up at my ceremony as well and I walked down the aisle to a song I hate, and the music was skipping. Our pastor TOTALLY screwed up my part of the vows and I didn't get to say 50% of them. My little sister was supposed to handle taking our guest photos (she's a budding photog) and her camera battery died before we even left the house! That in turn messed up the schedule with our pro photog b/c he had to squeeze in taking the guest photos, blah blah blah.
Over 6 months later, I still face palm myself when thinking about all the things that went wrong that day. And I still don't say more than 3 words my little sister when I see her (though my anger towards her has a lot more history than just that day, the wedding was simply the last straw). It still bothers me that I didn't get to say a huge chunk of my vows. And the next thing I think to myself is, "GSG, get over it!"
At the end of the day, we're married! One cannot change the past. And in the grand scheme of things, are the little wedding screw ups worth ending a friendship? If my sister and I had no other history, then I would've just expressed my disappointment and then let it go, and we would go forward. As many times as H and I have met with our pastor privately since the big day, I've never once mentioned the thing with the vows even though it still bothers me sometimes. Maybe one day we'll renew our vows privately, maybe not. I can't let those thoughts get in the way of my happiness and my sanity. As time passes, I care less and less about the screw ups that day. Now they're things that I'm able to laugh about. It's what made our day unique :)