 When Ernesto and Alberto are walking with the bike and reading the  newspaper "El Diario Austral" Alberto complains because they  misspelled his surname, instead of Granado, they wrote "Granados".  The Austral newspaper still exists, so, when the movie was being  filmed, the newspaper wrote a new article about the making of the  film and (this time deliberately) misspelled Albertos surname  again, 50 years later.