In an interview with Vulture, Jeff Goldblum said that he does not mind at all when he gets asked to essentially play himself on the big screen. "People write Jeff Goldblum-y parts and they want me to do them, and that's fine," he said. "I think I can even do a better version of it. So no, this little Jeff Goldblum row that I'm hoeing is still adventurous."
Screenwriter Colin Trevorrow said about Rexy, "We've been following this same character since the beginning; she's the same T-Rex that was in Jurassic Park (1993) and in Jurassic World (2015). She is iconic, not just because she's a T-Rex, but because she's this T-Rex."
A cryptic scene in Jurassic Park III (2001) had Dr. Alan Grant and Billy identifying the Spinosaurus as a species not on the list of species InGen were known to have cloned. Alan ponders what else they were up to. This movie reveals that several species of dinosaurs were present on Isla Nublar that were not officially announced to be on the island in Jurassic World (2015) in either the movie or its tie-in material, making Alan's line just as relevant today.
The fact that Isla Nublar is actively volcanic was noted in the first novel, and it seems approximately thirty years later, this detail finally becomes plot-relevant in dramatic fashion.
Constructing the park's destroyed Main Street was a unique challenge for the team. The Louisiana-based set had been dismantled after Jurassic World (2015), so everything had to be rebuilt in Hawaii, then properly "aged" and turned into rubble. "A lot of the very same prop makers re-created it," set designer Stella Vaccaro said, "and then they got to destroy it."