"Common Knowledge": A number of retrospectives on this show definitively state that Robbie is a Hypsilophodon and Charlene is a Protoceratops. While they do resemble those species, Word of God is that Robbie and Charlene weren't based on any specific real dinosaur species.
Because of music clearance issues, the Netflix, WatchABC, and Hulu version of "A New Leaf" replaces the scene of Mr. Richfield singing "Purple Haze" while high with an alternate scene of Mr. Richfield singing an original song about how happy the happy plant is making him. It's not as clumsy as other examples, but it is a screw to people who wanted to see the episode as originally aired. Averted when Disney+ uploaded the show with the original version of the scene.
On a lesser note, the original run of the series on ABC had a laugh track, which was removed for syndication and home video releases. Many agree the series is better without a laugh track. The foreign dubs also lack the laugh track as well.
In Memoriam: A dedication to Jim Henson appears in "The Mighty Megalosaurus". Henson died before the series premiered on ABC.
Missing Episode: The Disney Channel did not rerun "Baby Talk" (due to its theme about profanity and censorship) or "Dirty Dancing" (the episode is one giant metaphor for a boy experiencing erections for the first time and trying to lose his virginity). Surprisingly, the episode "What 'Sexual Harris' Meant" wasn't banned, as that had heavier subject matter (the episode centers on Monica DeVertebrae getting a job at WESAYSO and getting fired after calling her supervisor out on his constant sexual innuendos and turning down his offer for a date).
The Other Darrin: Played with. Fran's animatronic was redesigned for the second season so it absolutely does not resemble her first incarnation, but her voice actress (Jessica Walter) stayed on and played her for the entire series. Her suit performer also varied during the first couple of seasons before settling on Tony Sabin Price as the main performer.
Out of Order: Even though Charlene grew a bigger tail in "Charlene's Tale", certain episodes filmed prior showing her shorter tail such as "Employee of the Month" and "Unmarried... with Children" aired after it. There's also the seven episodes filmed prior to the series finale that were shown afterwards when the show moved to syndication.
Disney+ moves "The Clip Show" ahead in the episode order, before some of the episodes the clips come from.
Playing Against Type: Since she's now known for playing cynical, emotionally abusive, sexually promiscuous, alcoholic matriarchs (see: Lucille Bluth on Arrested Development and Mallory Archer on Archer), Dinosaurs is now considered the only time Jessica Walter has played a traditional sitcom wife and mother (read: one who's loving, supportive, and understanding to her husband and children, though the episode where Fran is a Stage Mom when Baby Sinclair is signed on to be the spokesbaby for a frying pan company does show Fran being cold and narcissistic to her family, but snaps out of it when Earl calls her out for only letting Baby Sinclair be a child star for selfish reasons).
Prop Recycling: The giant swamp monster that appears in "I Never Ate For My Father" and other episodes is reused from "Monster Maker", an episode of The Jim Henson Hour.
Reality Subtext: When walking, Earl has a habit of briefly pausing, slumping, and sighing before continuing on. This was because suit actor Bill Barretta was trying to peek through the mask's mouth and see where he was going. The action was incorporated into Earl's characterization.
"Endangered Species" borrows its central premise from a "Land of Gorch" sketch from Saturday Night Live. Both involve a species of creature so delicious to eat that the main characters have reduced it to near extinction.
"Changing Nature" has commonalities with the Fraggle Rock episode "Invasion of the Toe Ticklers". Both involve the removal of a species of insect from the environment and how that results in an overgrowth of undesirable plants the insects eat. Except while the Fraggle Rock take on the premise ends happily, the Dinosaurs version... not so much.
Screwed by the Network: During production of the fourth season, ABC cancelled the series altogether and aired "Changing Nature" as the series finale.
This was originally intended to be a dramatic feature film called The Natural History Project with Warner Bros. set to distribute and Jim Henson directing. However, when The Land Before Time was released, Henson decided to turn the idea into a sitcom, which CBS greenlighted. It wasn't until Henson's death and CBS putting the show into turnaround that the show got made.
Earl was meant to be gruff and intimidating, with a lantern jaw. To make him more likable, he was softened and his lantern jaw became a double chin.
A Dinosaursmovie was planned at one point, but the project fell through.
In the early development phase, Ethyl (Fran's mother) was originally conceived as a pterodactyl who hung upside-down in the closet, but after coming up with a few story ideas for her, they quickly realized that keeping her in the closet would limit what they could do.
The only puppet that still exists is Baby Sinclair, aside from a somewhat degraded unisaur head. The latex used to make the puppets degrades quickly in light, so most of them disintegrated rather fast.