It's Anna's birthday and Elsa plans to throw her the perfect surprise party with the help of Kristoff and Olaf. However, after planning the huge party and as Anna is being led on a "party treasure hunt," Elsa finds that she has caught a cold. She starts sneezing and produces a group of small, cute snow people, much like Olaf, with each sneeze. After some near-misses, a very exhausted Elsa finally makes it with Anna to the courtyard where the party has been arranged. It is a big hit, and at last Anna manages to convince Elsa into letting her to lead her to bed and take care of her. Meanwhile, Olaf has taken the tiny snow creatures under his wing and takes them to Elsa's ice castle with the help of Kristoff.
Did You Know?
The Roman numerals "MDCCCXL" are displayed on the map at the scene where Elsa sneezes at the bugle horn, making the setting around the year 1840.
Ultimately, based on Jennifer Lee stating that Elsa's birthday happened in the winter solstice, and Anna at the summer solstice, we can truly think of what their exact birthday is. Elsa's birthday is at December 22, 1817 (Monday), and Anna's birthday is at June 21, 1821 (Thursday). See more
In the first scene Sven is standing with four buckets (full of paint) hanging from his antlers. We see Elsa scolding Olaf for eating the cake for a few seconds, and then cut back to Sven: now the buckets have disappeared. It would be logical for Sven to have put them down at this point since Kristoff had just finished painting, but the buckets are nowhere to be seen on the ground or the tables, and Sven and Kristoff were standing too far from the entrance of the castle for either of them to have brought the buckets back inside in that short a time-frame. See more
[to the Snowgies which appear
During the Disney logo shown at the end, the shooting star that typically flies over the castle is replaced with a snowbie that jumps over the castle, and if you listen carefully you can hear soft chimes playing the tune of "Do You Want To Build A Snowman?", from the movie. See more
Followed by Olaf's Frozen Adventure