 The season 4 episode "Jurassic Bark" features a flashback to the  cryogenic room from "Space Pilot 3000". On its initial airing  observant viewers noticed that Nibbler made a brief appearance  during the flashback that was not in the original scene. This was  added to maintain continuity with the then unaired episode "The Why  of Fry". "Space Pilot 3000" was then modified for syndication and  DVD to reflect these changes. In this modified form, Nibbler is  visible under the table in all episodes featuring the cryogenic  room, with the exception of "Anthology of Interest I" where the  scene is shown during a hypothetical scenario where Fry does not  fall into the tube.