In the same episode, the Yankees decide to send George to Cuba in order to recruit young talent (owing to Steinbrenner’s mistaken belief that George is a communist). In a deleted sequence, George starts stressing out about how he’s going to get a travel visa. Then George remembers that Kramer has friends at the Cuban embassy, from his past attempts to score cigars. So George forces Cosmo (who’s still in costume as Santa) to escort him to the embassy.
When they arrive, the doors are locked, but Kramer recalls that his golfing buddies told him about a secret entrance that was used during the Cuban Missile Crisis. Of course, this entrance turns out to be a chimney, leading to a scene in which Kramer emerges from a fireplace in his Santa getup, surprising the room full of Cuban dignitaries, before exclaiming “Feliz Navidad!”
The article includes this scene and several other Seinfeld scenes with a holiday theme.