When Ebony wakes up on Christmas morning, she calls down to the man with the horse-drawn carriage and asks what time it is; he informs her it's 6:15 AM. However, it is very bright outside; on December 25 in New York City, it's still dark at 6:15AM.
In the scene where the Ghost of Christmas Past takes Ebony to her childhood hometown in New Jersey, they pass Mancone's Pizza ParLOUR, spelled the Canadian way.
During the final concert, the man standing next to Marli's ghost shifts over to give her room to move to the music although even Ebony is supposed to be able to see her.