Continuity mistake: The birthday cake disappears in some shots after they give it to Stan's grandfather.
Dr Wilson
7th May 2004
South Park (1997)
9th Feb 2004
South Park (1997)
Pilot: The Spirit of Christmas (Jesus vs. Santa) - S1-E1
Continuity mistake: When Santa Claus is spinning Jesus over him, Jesus' beard keeps appearing and disappearing.