Well, the way the banner party moves into line after the march-past is not correct, according to an Ex-QCS WO who should know that sort of thing. It used to be right but was changed and there doesn’t seem to be any drive to correct it.
The one that they tripped over in 2017 was whether the “DI” at the side should call the Eyes Right/Front (which they should), or whether the bearer calls it (which they went for).
The DI is giving the parade commands that would be given by the Parade Commander and the No1 Flight Commander in the parade that the banner sequence is simulating. During the march-past, the banner party follows the commands of No1 Flight Commander: the Quick March and the compliments.
There are probably a few more. It has been tweaked fairly regularly, but mostly minor items.