first off there are many who believe that Revelations was written before 70CE and may be regarding Nero as the beast and there is nothing to really show they are wrong.... one point made is that the fall of Jerusalem is completely absent in the story, which is odd since it would be a major fulfillment to hang future ones upon....
second, Jesus said that ALL THINGS would happen in THIS GENERATION, not no future one... he was mistaken, making him a false prophet, end of story (^_^).
3rdly there is no possible way that any mistakes in the bible will EVER be acknowledged by the faithful.