In the [*Futurama*](http://en.wikipedia.org/wiki/Futurama) season 3 episode ["Luck of the Fryrish"](http://en.wikipedia.org/wiki/Luck_of_the_Fryish), we learn that Fry's brother Yancy had a kid named Philip, after his lost brother.  However, in the movie [*Bender's Big Game*](http://www.imdb.com/title/tt1054486/), we see Fry travel back in time and return to his life for 12 years before being hunted down by Bender and freezing himself in his ex-girlfriend's cryotube.  Doesn't this mean that the history of Fry's nephew didn't happen as we saw it in “Luck of the Fryrish” (so it's a [retcon](http://en.wikipedia.org/wiki/Retroactive_continuity))?