I assume they showed it again to give people a chance to see it again. Or they have the rights to show it twice so just used it to fill a Saturday afternoon slot.
FOX in America is doing all these Ice Age promotions as well, for example, that squirrel with that accorn pops up when the programme returns and disappears and a slightly transparent Ice FOX logo pops up and melts away and then the normal transparent DOG fades in.