This currently does not fully summarize the article per WP:LEAD as it fails to take into account the plot, the production process, and what critics said about the short
"After some near misses, Elsa collapses and nearly falls off the clocktower. Finally, Anna manages to convince Elsa" → "After Elsa collapses and nearly falls off a clocktower, Anna manages to convince her"
"It is a big hit with Anna, but Elsa accidentally sneezes a giant snowball through a birthday horn (bugle horn or bukkehorn) cannon-balling it all the way to the Southern Isles, where Hans is serving punishment for his actions in the first film by scooping horse manure"..... overkill, just go with "While Anna enjoys the party, Elsa sneezes a giant snowball through a horn that flies to the Southern Isles, where Hans is seen scooping horse manure".
"Anna tells Elsa that allowing her the chance to take care of her was the best birthday present of them all"..... too wordy, just say "Anna tells Elsa that her favorite birthday present was the chance to take care of her"
This and its subsection "Home media" are far too short for their own sections/subsections per MOS:PARAGRAPHS, so I'd merge it with "Reception" to make a "Release and reception" section
"Is as follows" from "The summary of the short is as follows" isn't really encyclopedic, and including a summary quote here is repetitive when there's already a section for the plot
This currently does not fully summarize the article per WP:LEAD as it fails to take into account the plot, the production process, and what critics said about the short
"After some near misses, Elsa collapses and nearly falls off the clocktower. Finally, Anna manages to convince Elsa" → "After Elsa collapses and nearly falls off a clocktower, Anna manages to convince her"
"It is a big hit with Anna, but Elsa accidentally sneezes a giant snowball through a birthday horn (bugle horn or bukkehorn) cannon-balling it all the way to the Southern Isles, where Hans is serving punishment for his actions in the first film by scooping horse manure"..... overkill, just go with "While Anna enjoys the party, Elsa sneezes a giant snowball through a horn that flies to the Southern Isles, where Hans is seen scooping horse manure".
"Anna tells Elsa that allowing her the chance to take care of her was the best birthday present of them all"..... too wordy, just say "Anna tells Elsa that her favorite birthday present was the chance to take care of her"
This and its subsection "Home media" are far too short for their own sections/subsections per MOS:PARAGRAPHS, so I'd merge it with "Reception" to make a "Release and reception" section
"Is as follows" from "The summary of the short is as follows" isn't really encyclopedic, and including a summary quote here is repetitive when there's already a section for the plot