the snow storm being part of the way up to elsa's palace (instead of the way down in the game), and the ice labyrinth being connected to Elsa's Ice palace(underground with one of the platforms in the highest level leading to elsa's palace, since it's snowflake shaped and all), and it being the dungeon before the final fight with elsa as the wolf, making better use of Marshmallow as he would have been with you during that entire dungeon.
Man, this would've been a much better explanation than Larxene being able to just snap a huge castle made out of a foreign element out of her fingers and just commenting it with "it's not my style". I sat there and was just like ... "how did you even do that, this doesn't make any sense".