In the second story (Goofy and Max's story) Max stays up all night with numerous shots of his alarm clock. The next to last time you see the clock it is 4:39 AM and the very next time you see it the clock reads 3:00 AM.
After Huey, Dewey and Louie first throw the card with their sleighs, it lands on Donald. The Christmas tree on the card is upright but the card opens to the right, not left. The tree should be upside down.