Jurassic Park can get away with scientific inaccuracy in the appearance of dinosaurs since it's established in the book and film series that the dinosaurs are basically imperfect hybridised reconstructions rather than exact replicas of real ones.
I agree. That and the fact that palaeontologists since the release of the book and film have unearthed (ouch, sorry about the pun) new fossils which does not agree with what researchers originally thought. That is very easy to live with as a viewer.
The revelation that amphibian DNA lead to the spontaneous changing of gender is dealt with more casuallyy in the film but Crichton does go into it in more detail in the novel including Wu's thoughts about it.