Revealing mistake: In the beginning of the movie when Charlie is in the gym, the last can of spray paint he uses, just before the Principal catches him, appears to spray 'clear'.
Revealing mistake: At the end of the movie, watch closely as Santa comes to tell Lucy about how he is Santa. He comes through the chimney and shakes a little bit. Later, when he leaves, that very same shot is shown (with all the same movements), only in reverse.
Answer: They become widows, presumably, stop being "Mrs. Claus", and go back to living a normal life.
Phixius ★