Disney animators frequently used to recycle footage from older animated films. They would draw over existing animation cells to make new scenes with characters with similar designs, characteristics, and movements.
Check out this video, you would never notice until it is pointed out
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A Frozen Boat Ride is Coming to Walt Disney World, and Now it Has a Name which is *Frozen Ever After*.
This is an extract from Theme Park Tourist website:-
Because of the accelerated development time for this new attraction, many Walt Disney World enthusiasts were worried that Epcot’s Frozen ride would rely heavily on screen-based effects (which can be quickly installed and are fairly cheap to produce). However, the aforementioned Wall Street Journal article has confirmed that animatronics of characters Grandpappy Troll, Sven, Olaf and of course Elsa are being built for the ride, while concept art showcases some impressive digital projection effects in the background.