My guess is the away scene was going to be a lot different. My reason for thinking this is that oddly incongruent end sequence. They had that long CGI sequence at the end, after the entire plot of the episode has finished, where the camera does an extended flyaround on the Cretaceous Earth. CGI isn’t cheap. Someone had to animate all that. That sequence really screamed, “shit. We spent all this money on these dinosaur animations. But now the script’s changed, so we can’t use even half of it. I know! Let’s add an inspiring sequence at the end!”