Other mistake: When Snoopy starts sneaking through the pumpkin patch, Sally is standing with her arms crossed and Sally's hand is painted blue while talking to Linus. (00:20:35)
Other mistake: Robin yells "Holy Polaris" before the rocket even breaks the surface of the water.
Other mistake: When the Grinch is cutting Max's antler, the pieces that have fallen on the floor suddenly jump several inches closer to Max.
Other mistake: Actor Robert Pine's English accent comes and goes in his scenes with actress Debbie Watson.