The mouse himself “makes the quickest of cameos in ‘Frozen,’” writes Disney. “A small Mickey Mouse plush sits on one of the lower shelves in Wandering Oaken’s Trading Post and Sauna.”
Rapunzel and Flynn from ‘Tangled’
“Elsa’s coronation draws guests from far-away lands—and movies,” writes Disney. “From ‘Tangled,’ Eugene Fitzherbert aka Flynn Rider and Rapunzel even made the guest list.”
‘Wreck-it Ralph’ candy
Last year’s movie from Walt Disney Animation Studios was a runaway success, and despite the entirely different settings between Wreck-it Ralph and Frozen, Disney found a way to mix the two.
“Anna’s affinity for chocolate summons sweet treats all the way from the land of Sugar Rush in ‘Wreck-It Ralph.’”
A Disney animator’s painting
Disney animator Lisa Keene’s painting, “completed during the development phase of ‘Tangled’ and based on ‘The Swing’ by Jean-Honoré Fragonard, made such an impression on ‘Frozen’ filmmakers, it became part of Anna’s signature song, ‘For the First Time in Forever,’ when she leaps into the air and mimics the painting’s pose,” writes Disney.
When the horse that Anna took when she set out to look came back and Hans said something like "Easy boy, easy" wasn't that a Tangled reference to when Rapunzel says that to Maximus? Even the tone was really similar.