Cache not at published co-ordinates.
Steven Spielberg's Jurassic Park (1993) has been our family's favourite film from the beginning and, despite all the later additions, we always go back to the original and best. To find this cache, you will have to descend to a truly Jurassic world of tree-ferns and podocarps where it only takes small leap of the imagination for therapods and sauropods to appear from between the trees. This is one of my favourite short walks in New Zealand and I hope you enjoy it as much as I do.
Actually, most of the dinosaurs in the film (and the book) were from the Cretaceous Period (145 to 65 million years ago) rather than the Jurassic (201 to 145 million years ago). I suppose Cretaceous Park just didn't have the same ring. Spielberg also played pretty fast and loose with the actual dinosaurs - velociraptors were only about the size of a turkey, probably weren't pack hunters and only lived in Asia, so Alan Grant couldn't be excavating one in Montana. To be fair, though, Michael Critchton actually took Deinonychus as his model. They did live in Montana, were the size depicted in the film and fossil evidence suggests they were pack hunters. Critchton just preferred the name "velociraptor". He also made the early-Jurassic Dilophosaurus venomous and Spielberg added the frills!
So, some inaccuracies were for dramatic effect but some were just out-and-out stuff-ups! When I watch the film, one glaring mistake always leaps out at me. So I thought it might leap out at other people and make a good basis for a puzzle. Enjoy!
You can validate your puzzle solution with certitude.