Wikisimpsons - The Simpsons Wiki
At the Springfield Elementary School's Christmas pageant they had a act with Santas of many lands. Marge took Bart and Lisa's list of presents to post them to Santa's workshop at the North Pole. Bart told her that there's one fat guy that brings us presents and his name ain't Santa. When Marge looked at Lisa's list, she told her that she kept telling her that Santa can't fit a pony in his sleigh. Meanwhile, Ned Flanders was placing a Santa at the top of his roof. Barney told Homer that he got a part time job working as a Santa down at the mall. Homer asked if he can also do that and he could and did after ha was at the Santa School. When Homer later worked Milhouse was dared by Bart to yank Santa's beard off, which he did and found out that Homer was Santa.
Kent Brockman once reported that Americans have grown up with the image of the jolly fat man, citing Dom DeLuise, Alfred Hitchcock and Santa Claus. Upon mentioning Claus, he showed a dramatization of Santa in the hospital and dying, saying that in real life Santa would suffer from gallstones, hypertension, impotence and diabetes.
When Homer made a large donation to Costington's (to make up for his ill-gotten gains from serving as Mr. Burns's "prank monkey"), he was invited to play the part of Santa Claus in the store's Thanksgiving Day parade. Homer messed up his line, yelling "Merry everyone!" to the crowd instead of "Merry Christmas!", and Burns tried to persuade him to use the occasion to play a prank on the whole town (offering Homer a million dollars to throw fish guts to the crowd instead of presents). Homer was torn between the money and the fact that "Santa can't be evil!", but in the end he stood firm and refused to go along with the prank.
In a commercial for a book called The Answer, it says Santa Claus was one of the few people to have read the answer. When Edna Krabappel looks out the window in to the school playground, Santa is there, it is unknown whether this is just her imagination or if he really was there.
In another dream from Homer Simpson, Homer dreamed that he was playing baseball. Steroid Santa Claus pitched the ball to him and Homer broke the sky with his swing.
A model of Santa Claus was seen on a house opposite the Simpsons' house. Homer imagined the model turning into a monkey.
He also was in his office in the North Pole in Bart's dream. Here, he pretended that he was poor so Bart would leave feeling sorry for Santa. He then pressed a button to change his office into a disco-like room. He was portrayed by Krusty in the dream.