During the end credits two Japenese Fisherman (who are badly dubbed in English) discover the island all frozen and then start to hear rumbling until they soon find out it's "JACKZILLA!" And we see Jack's Giant carrot nose fall and hit their boat and the boat is destroyed.
After all the end credits finish the music continues as we see a door to the giant freezer where Marla and Joe ran in to get away from Jack and Sam and Anne forgot to rescue them. As soon as the song fades out Marla and Joe call for Sam's and Anne's help to open the door to get out of the freezer. There is a momoent of silence as they are both end up frozen to death inside the freezer.