Years ago, Busch Gardens Tampa had a show called Christmas Celebration that started out as a Santa show all the way and ended with Go Tell It on the Mountain. They literally went from singing Frosty the Snowman to doing a Gloria-style finale in church robes. Both parts of the show were very good on their own, but the complete thematic switch in the last three minutes of the show was very jarring.
If the park could somehow explain the direction of the show (different aspects of Christmas) right at the start without sounding apologetic about it, maybe they could improve it a little bit. The finale is my favorite part of the show, even though it totally throws off any consistency. Visually, it’s the most impressive scene, and it also usually sounds the clearest out of any of the songs in the show. I think it would be a shame to lose that number, but something needs to be done about it to make it less like Christmas Celebration at BGT.