Continuity mistake: When Anna's singing "The next right thing" she puts a bag on her shoulder, with the strap on top of her hair. After the camera spins round her, her hair is suddenly on top of the strap. This bears a strong similarity to the mistake in the original Frozen where Elsa's hair passes through her shoulder - might be a deliberate nod, or else animating hair around objects is difficult enough that shortcuts are often taken.
Trivia: When Olaf just starts to sing "When I Am Older" count for about 10 seconds and watch the fire jump from tree to tree. If you watch the right side of the screen closely at the 10 seconds point, you can see the fire briefly take the form of Mickey's head.
Question: Olaf fades away once Elsa dies because he can't live without her magic. He is only revived by Elsa after she revives. The post-credit scene shows Olaf in Elsa's ice palace telling a story to Marshmallow, the giant snowman and the tiny snowmen. How is it possible that Marshmallow and the tiny snowmen are still alive after Elsa froze to death? Did Elsa guess they have faded away too and managed to revive them? Did she even have to rebuild her ice palace?
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Answer: Since the answer is not given in the movie, I think you have found a plot hole and a possible solution for it.