An old-school Ray Bradbury fan like myself couldn't miss, just from the title and a one-sentence summary, that this is an adaptation of a classic Bradbury short story. This being Hollywood, almost the first 15 minutes are true to the original story. The rest is a vastly different, make-up-the-rules-as-they-go-along Hollywood-blockbuster-y attempt to capture some of those lucrative Jurassic Park moviegoing dollars, by finding an excuse to put overgrowth and dinosaurs in in Manhattan chasing scientists around. I wonder... maybe this was a good movie, but then someone accidentally went into the distant past and... changed something... and we got this instead. Yet another lesson not to mess with the timestream.