The coronation of Queen Victoria was a disaster that lasted five hours, to begin with the Archbishop of Canterbury forced the coronation ring onto the wrong finger, causing the young Victoria severe pain, they were unable even to remove the ring afterwards (three years later he did the same thing again at her wedding).
The Bishop of Bath and Wells accidentally turned over two pages in the service book, completely cutting out the section were they made her queen. Thus making the coronation invalid, it was only after the coronation was over that they realised what had happened and had to bring her back and do it all again.
As the Lords were being presented to her, the elderly, and rather aptly named, Lord Rolle became globally famous for tripping over the steps leading to the throne and rolling all the way down, the Queen however had not particularly endeared herself to the public until that moment, when she got up and tried to help him.
There where numerous other accidents and failures throughout the ceremony, all well worth looking into.
Further Info: https://en.m.wikipedia.org/wiki/Coronation_of_Queen_Victoria