Though the creators of Phineas and Ferb do sometimes forget to do this, there are plenty of examples:
- In "Day of the Living Gelatin", Ferb describes that gelatin is extracted from cartilaginous fibers of the bovine patellar structure.
- The Tsiolkovsky rocket equation gag from "Out to Launch". With the obvious exception of the bomb/smiley face punchline, that is what the Tsiolkovsky rocket equation looks like.
- Take this line from the song "X-Ray Eyes".Sometimes photons behave like a wave,But they're particles when you reflect 'em.
- The Lion-Tiger-Bear Guy from "The Wizard of Odd". No, it's not just a pun on the famous quote, there is an animal in the original Wizard of Oz book that is a hybrid of all those animals.
- In "Tour de Ferb", it's noted that holding a wombat close to one's face is not a good idea. Considering how strong and aggressive wombats can be in real life, this is Truth in Television.
- In "Doofapus", Doofenshmirtz mentions that platypuses are in the genus Ornithorhynchus and come from eastern Australia.
- In "Where's Perry?", Ferb accurately describes the discovery of the platypus by European scientists, even mentioning that it was George Shaw who wrote the description of the species in 1798.
- The bird that comes to perch on the rhino agent in "What'd I Miss?" is a red-billed oxpecker, a species that is actually known to perch on rhinos in real life. Its presence in North America, however, is strictly Rule of Funny. That said, the symbiotic relationship shown in the episode is actually outdated information, as oxpeckers eat the parasites on rhinos simply for blood, due to being parasites themselves (they'll even open wounds to get the blood).
- "Primal Perry" mentions platypuses having venomous spurs and shows Perry using his bill to probe the bottom of a pond. They also state platypuses and platypi are both correct plural forms for platypus.
- The show sometimes notes that platypuses sweat milk. As female platypuses do not have teats, they secrete milk directly from the skin on their belly, thus, in a way, sweating milk.
- Many of the facts stated about bee biology in "Bee Day" and "Bee Story" are correct.
- The documentary Candace watches in "Perry Lays an Egg" mentions the scientific name of the green sea turtle, Chelonia mydas.
- "The Return of the Rogue Rabbit" has several characters identifying rabbits as lagomorphs and specifically saying that they are not rodents.
- Though the cave salamander in "Save Summer" is colored more similarly to a surface-dwelling salamander and possesses gills more like a fish's, external gills and lack of eyes are common traits among cave salamanders in real life.
- In "Leave the Busting to Us!" Ferb says, "Gladiators were Roman, not Greek" acknowledging the intentional error, the idea of gladiators being Greek, found in the previous episode, "Greece Lightning."
- "Belly of the Beast" mentions sharks having cartilaginous skeletons.
- In "Druselsteinoween", the moat around the castle has a hippopotamus which attacks Doofenshmirtz when he falls into the water, which makes sense when you realize how aggressive and territorial hippos are in real life.
- Although the folding sequence for the giant paper airplane in "Summer Belongs to You" is completely nonsensical and runs mainly on Rule of Funny, the origami unicorn it produces at one point looks very similar to many actual origami unicorns. Not bad for an art that's usually reduced to cranes, swans, hats and the occasional fortune tellernote in popular culture.
- The song "Everything's Better With Perry" refers to Perry as Ornithorhynchus anatinus, the scientific name of the platypus.
- The intro of "The OWCA Files" showed a koala agent with two thumbs.
- Also from "The OWCA Files", during the long trip to the Grand Canyon a bored Maggie is shown plucking out her own feathers, which is a common behaviorial problem macaws develop from boredom. Also, while most scenes show her with the stereotypical three toes in front and one in back, some shots show her with the correct two toes in front and two in back.
- The sound that Perry makes is actually very close to the sound platypuses make in real life. Though it’s subverted since it turned out they were accidentally correct.
- In "Boyfriend From 27,000 B.C.", Phineas gives proper dates to the prehistoric specimens frozen in the Danville Glacier: a Stegosaurus for the Jurassic, a Pteranodon for the Cretaceous, a woolly mammoth for the Pleistocene, and Conk the Neanderthal for the Paleolithic.
- While scorpions in the show are usually drawn with the stereotypical six legs, "Phineas and Ferb Save Summer" shows an illustration of a scorpion with the correct eight legs.
- "Unfair Science Fair" has a model of Pluto which is correctly colored brown and yellow, as opposed to blue as in classic portrayals.
