Just FYI, the Swan Princess movie (good as it was) was NOT Disney, so any references to it will not be as likely/overt as to Disney canon.
However, that doesn’t mean it’s not a reference, and obviously the classic tale is more than fair game. In fact, Sofia the First has quite the liking for swans.
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Keeper of Belle's Gold magic, sand dollar, cloaks, purple FTL outfit, spell scroll, library key, copy of Romeo and Juliet, and cry-muffling pillow, Rumple's doll, overcoat, and strength, and The Timeline. My spreadsheet: https://drive.google.com/file/d/0B6r8CySCCWd9R0RUNm4xR3RhMEU/view?usp=sharing