They could have found a way to use the Holiday Road song
I know that many people have said that since they didn't do a road trip, this song isn't really needed for this particular vacation film. However, with all the brainpower and script people in on this, they really could've found a spot to put it in that would've made sense.
The opening song during the cartoon was lame. I know that even fans on this very board could figure out how to use the song!
That would make 3 Christmas' I've saved, vs. 8 that I've ruined; two were kind of a draw..