I was only aware of one other video that seemed like a similar situation from a completely different character. You're saying there's more?
Again, you're expecting people in costumes that provide very limited vision and are quickly walking along a parade route to make certain they don't accidentally exclude any minorities. That's completely unrealistic.
If I were a theme park manager, my solution would be no longer allowing crowd iteraction at all during parades or mass groupings beyond waving at them. That's a shame, but how else would you prevent claims of racism the next time a minority gets missed?