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dinosaurs appear in the mesozoic valley garden based on the amount you have (1st one at 1, 2nd at 25, 3rd at 50, 4th at 100, and 5th at 250), 2 appear at a time if they are flying (all pterodactyls, last 3 archaeopteryx) there are some exceptions to this, some of which seem intentional while others are probably bugs, here is a list of them (picture is a 13k image of the garden, so you can see where dinos are, note that some of them move around so some may not always be in the same spot)
less than 5 total spawning
5th ornithischia, sauropoda, velociraptor, and pachycephalosaurus don't spawn (probably could add a 5th one, but that doesn't mean there's supposed to be a 5th one)
5th brachiosaurus doesn't spawn (this is due to the 2nd spawn not happening (spawns at 1/50/100/250 but not 25)
only 1 tyrannosaurus rex and giganotosaurus spawn (highly doubt this is unintended)
3rd-5th spinosaurus's don't spawn (only 1 on land and 1 in ocean, might be hard to add more to the ocean, but more could be added to land (1 next to the current one, others would need to be next to the ocean, since most of the area around the current one is taken up by the saurischias walking path)
4th-5th icthyosaurs, eoraptors, and mosasaurus's don't spawn (plenty of room for more, but that doesn't mean there needs to be)
4th-5th cynodonts don't spawn (4th not spawning is due to the 2nd spawn not happening (spawns at 1/50/100 but not 25)
3rd-5th argentinosaurus's don't spawn (2 spawns are skipped (spawns at 1/100 but not 25/50) skipped spawns might be intended if there's only supposed to be 2 total)
other
4th sauropoda despawns when leaving the garden (respawns when buying one, stops despawning after 5th would be unlocked if it existed)
willow hare