Disney's Zootopia took viewers through a magical universe of anthropomorphic animal cityscapes filled with vibrant colors, gorgeous art design and intricately developed cultures.
Also, in between all brilliant world-building details, the creators managed to throw in a few brilliant, subtle references to the beloved 2013 film, Frozen.
ET has an exclusive look at the "ZPD: Forensic Files" Blu-ray extra, detailing all of Zootopia's hidden Frozen Easter Eggs. Some are a bit more obvious than others, while some are wildly obscure and hard to find.
The shifty, small-time crook is voiced by Alan Tudyk -- and the name is a reference to Frozen's Duke of Weselton, who was also played by the 45-year-old Firefly star.
Tudyk has actually played a villain (or similarly suspicious suspect) in the last four Walt Disney Animation Studios films -- including King Candy in Wreck-It-Ralph and tech mogul Alistair Krei in Big Hero 6.
In Zootopia, humans don't exist. So it only makes sense that they wouldn't appear in the films that exist in that world either -- which is why, in Zooptopia, Disney films like Big Hero 6, Tangled and Wreck-It-Ralph are called Pig Hero 6, Wrangled and Wreck-It-Rhino.