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1
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By playing as Peachette in the final level of Peach's Castle, the real Peach will act confused before the fight plays as normal.
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2
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The game's reveal trailer on September 13, 2018 shows Mario being played in the levels "Waddlewing Warning!" and "Larry's Trigger Happy Castle". This is not doable in the final game as those are levels from New Super Luigi U, where Mario is not a playable character.
Reveal Trailer for New Super Mario Bros. U Deluxe: https://www.youtube.com/watch?v=6wTFy-pJFMI?t=37
Evidence of the levels being from New Super Luigi U:
https://www.youtube.com/watch?v=VuT8JjMnVhM
https://www.youtube.com/watch?v=DNcegeMfLTc
Evidence of the levels being from New Super Luigi U:
https://www.youtube.com/watch?v=VuT8JjMnVhM
https://www.youtube.com/watch?v=DNcegeMfLTc
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