In the Christmas carol that the staff was singing, they "received":
7 Giant Colons
6 Small Intestines
5 Prolapsed Hemorrhoids
4 Gastric Ulcers
3 Yellow Gallstones
2 Fatty Livers
And an asthmatic in the E.R.
Dr. Canfield: We've got a lot of gifts to give out. We'll start at pediatrics, then go to geriatrics, and if we don't make it to the psychiatric ward, we'll just tell them it's Christmas on Tuesday.
Doogie's Journal Entry: December 25... Christmas. Getting is good. Giving is better. Once you understand that, it's always Christmas.
The German episode title is "Frohes Fest, ihr Lieben", meaning "Happy Holidays, Your Loves".
Episode title: "Doogie the Red-Nosed Reindeer"
This is a reference to Rudolph the Red-Nosed Reindeer from the popular Christmas carol and story of the same name.