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I bet Ross Geller had A LOT to say about these movies.
Paleontologist Reuben A. Rodriguez de la Rosa proposed some dinosaurs transmit venom in a similar way to venomous snakes. Scott D. Sampson of the Utah Museum of Natural History hypothesized that dinosaur bites could’ve been deadly due to large quantities of bacteria in their mouths (similar to Komodo dragons). However, in both theories, they’d be incapable of projecting the venom onto their prey.
You know the standard dino position: elbows at your side, arms in, and wrists all the way down. Well, scientists think that it might be incorrect. Instead, the wrists of the velociraptors would've been turned inward like the velociraptors were constantly holding a basketball. This would've made it much more difficult for the raptors to open the door to the kitchen.
Jurassic Park writer Michael Crichton was inspired by paleo-artist Gregory Paul, who wrote the book Predatory Dinosaurs of the World. In the book, due to the similarity of the anatomy of velociraptor and deinonychus, Paul grouped the two together. However, the creatures that Crichton describes in Jurassic Park are more similar to deinonychus. They match the same height and have a protruding toe just like deinonychus, but "velociraptor" sounds cooler.
Real velociraptors are estimated to have been about the same height as a medium-sized dog. They probably wouldn't have gone past your knee.
We can't blame Crichton or Spielberg for this one, but we can blame Colin Trevorrow. The American Museum of Natural History confirmed that velociraptors had feathers in 2007, 24 years after the start of the Jurassic Park franchise and 8 years before Jurassic World. The research was there, so where were Echo and Blue's feathers?!
Previously, T. rex was thought to be able to reach speeds of 40 MPH, making the scene where it runs after Ian Malcolm and his Jeep convertible intense. However, new studies suggest that T. rex could only run 15-25 miles an hour, meaning if you were on foot, you'd be no match for him, but your car would help you escape.
Mosasaurs did not have the same texture as a crocodile. IRL, they were smooth with small scales. Secondly, the Mosasaur in the movie was exaggerated in size. Mosasaur was big, but in the movie, we see it snack on Indominus Rex, which is larger than T. rex. In reality, mosasaur reached lengths of 50 feet, and T. rex would've been roughly 40. Lastly, mosasaurs wouldn't have been able to power their body through the water fast enough to make the kind of breach they do in the movie to munch on the shark.
A full skeleton that close to the surface that is completely intact and requires little dusting off is highly unlikely. Researchers spend extensive time in the field to locate and safely uncover fossils. Bones that are exposed like that are extremely brittle, meaning that someone couldn't casually pick the dirt out of a velociraptor's nose without a very high risk of damaging the remains.
Researchers from the Faculty of Life Sciences at The University of Manchester tried to harvest DNA from young sub-fossilized insects preserved in copal (the precursor to amber) to no avail, suggesting that the likelihood of finding ancient DNA in a specimen much older is much less likely.
A team of paleogeneticists at the University of Copenhagen and Murdoch University determined that after 1.5 million years, the nucleotide bonds in DNA would be too short to get any meaningful data. Dinosaurs are said to have gone extinct 65 million years ago, so any nucleotide bonds between their DNA strands are most likely unsalvageable.