This was not only the first (and last) time Frosty (and his family) was animated using Animagic, but this was also the last time Rudolph was animated with the Animagic process.
Millie:
Why do you want to stop the fireworks, Daddy? Aren't you patriotic?
Frosty: Sure I'm patriotic. My only regret is I only have but one life to melt for my country.