- He is the first and only disabled pup in the series.
- The second and the third are Charger (missing part of a leg) and Wheeler (autism) from "Rubble & Crew".
- Although, Wheeler's disability is just fan speculation.
- The second and the third are Charger (missing part of a leg) and Wheeler (autism) from "Rubble & Crew".
- So far, it is unknown why Rex is disabled.
- It's likely he was born with legs too short to walk properly.
- It's also unknown if Rex legs will be restored or healed.
- His name is a reference to the Tyrannosaurus Rex, a dinosaur.
- Rex also means "king" in Latin.
- In an early toy, Rex has yellow eyes instead of brown.
- He is a Bernese Mountain Dog.
- Like Everest, Tracker and Coral he does not live with Ryder and the main pups at the Lookout. He acts as a fifth reserved member of the PAW Patrol, being called on when his skills (in dino knowledge) are required.
- It is unknown how he got his badge.
- It is possible that he did a rescue like Everest to earn his, but off-screen.
- Rex lives in the Dino Wilds with Cap'n Turbot's relatives, making him the first pup of the reserve team not to be alone, lost, abandoned, or forgotten. It is likely that he was adopted by Dr. Tammy Turbot and her daughter.
- Rex is the third member of the team to speak the language of other animals along with Chase and Marshall. Along with Tracker, he could be considered bilingual.
- Rex has been first called on a mission 5 times.
- Rex has been called for backup 1 time.
- Rex has been called into action (either a first response or backup) 6 times.
- Rex has never been first deployed with Marshall or Rubble as a pair of two.
- Though it has happened in the episodes, "Dino Rescue: Pups and the Big Rumble" and "Dino Rescue: Pups and the Lost Dino Eggs", it was with the other pups at the time.
- Rex and Everest both do not take off part of their outfit (vest for Rex and hat for Everest) when off duty.
- He is the only pup to walk (drive) into his vehicle.
- As the Mighty Pups saga ended with "Mighty Pups, Charged Up: Pups vs. Three Super Baddies", Rex, including the rest of the new pups who debuted in sub-series after him, did not obtain Mighty Pup powers alongside Wild as well.
- Not counting "PAW Patrol Mighty Pups: Save Adventure Bay!", which came out after the last Mighty Pups episode.
- In the episode, "Dino Rescue: Pups Save a Pterodactyl", it is implied that he has a fear of velociraptors.
- In some promotions, his collar is blue instead of lime.
- Rex can technically go on his hind legs without using his paws since he's able to do it automatically with his wheels. (ex: when picked for a mission).
- Rex is the only side member to not have his vest out prior of missions/rescues.
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