It’s not even really Ancient Greek though, is it?
The Soviet movie Liberation: The Fiery Arc (1970), about the Battle of Kursk (the largest tank battle in history), did justice to its subject. All of the German tanks shown in closeups and longer shots where they were the focus of attention were convincing mockups.
If you watched the edges of the screen, however, you could see most of the tanks moving in the distance were modern T-62s that hadn’t even been repainted. (And there must have been hundreds, if not thousands, of them.)
Not to mention that when belted plaids did come in to use, as pointed out they were worn by Gaelic-speaking Highlanders, a completely separate ethno-linguistic group from Wallace and his Scots-speaking Lowlanders. Wallace probably thought of Highlanders the way 19th c. Western settlers thought of Plains tribes - as dangerous, thieving “savages”.
Between the belted plaids, the woad face-paint, and the lack of mail, Braveheart is an ungodly stew of anachronisms. Imagine an Italian director decided to make a biopic of George Washington, and had him leading the Continental Army dressed in buckskin chaps, cowboy boots, and a wide kerchief, then topped it off with a Greek hoplite helmet; that’s about as ahistorical as Braveheart’s costuming is.
Relevant Perry Bible Fellowship comic;
Yep, that’s about as accurate as Braveheart.
Bernadette Banner, a costume historian with a popular YouTube channel, got very exercised over Outlander’s Claire Fraser, who doesn’t wear stays and has a pair of zippered boots, in 18th c. North Carolina. But there is an in-universe explanation for both - Claire is a time-traveler from the 20th c. who brought the boots with her, and simply refuses to wear stays or corsets.
The swastika is backwards! 
Floating rubber balloons, I’ll grant you.
Floating paper balloons, though - perfectly period.
It’s been a while since I’ve seen the film, but I seem to remember the English wearing fairly accurate armor, with plenty of mail, as well as coats of plates and other “transitional” armor typical to the period. It was just the Scots who were turned into Ewoks.
Yer bein’ facetious, I know, but Archelon isn’t ancient Greek. It’s a modern synthetic scientific name constructed from Greek words in 1895 by Paleontologist George Reber to name the new giant turtle fossil from the late Cretaceous that he’d discovered in South Dakota, Archelon ischyros.
and, yeah, the specimen found was only about 12 feet long – big, but nowhere near as big as the creature in the movie was.
That reminds me that Lois Bujold reported people complaining about American plants and animals (for example, one character had a raccoon as a pet) in her Sharing Knife books. The complainers expected it was a fantasy based on European mythology, as so many other fantasty stories are.* But it was actually based on an American Indian myth, so wasn’t wrong at all.
*The archtypical European fantasy, LotR, has a couple mistakes of that sort, the major one being smoking pipeweed.
Not to mention that if you pay attention to the geography in The Sharing Knife it’s very clear it’s North America, although a somewhat altered one (all the Great Lakes seem merged into one).
It wouldn’t surprise me if the term “pipeweed” originally encompassed herbs. Euell Gibbons wrote of smoking coltsfoot and a herbal mixture from England. Apparently it’s still a thing:
Fannish retcon. Tolkien was a pipe smoker. There’s no question what that pipeweed was meant to be.
Hmm, was I surprised to find the origin of the term:
https://en.wiktionary.org/wiki/pipeweed
But I see that Lord of the Rings fans have taken this to an entirely new level:
Of course, they have. There’s no end to the amount of fanwank LotR fans crank out.
Not to mention eating “taters”.
And the Wizards, at least, are savvy enough to know how to make black powder and that white light consists of multiple colors.
One thing I liked about the Song of Ice and Fire is that Westeros was clearly North America, with turkeys, corn, pumpkins, bison, alligators, mountain lions and sasquatch.
Yes, that was the other one.
Those fireworks are magic. No need for mundane explanations.
They actually are one unified system.
It’s consistent, though, with the bomb that Saruman’s orcs use to blow up the wall at Helm’s Deep.
The incident is in the Tolkien book, but it’s also depicted in the Peter Jackson movie. In the extended edition, Saruman grabs Wormtongue’s hand when he’s playing with a glass flask full of a black powder near a flame while they talk about strategies. The implication is that the flask contains explosive that the orcs are later shown using.
It was evident to both Jackson and to me that Tolkien intended the Wizards to have gunpowder technology. I’ve never interpreted Gandalf’s fireworks in any other sense – as described by Tolkien, they look and act like fireworks, not like magical devices (like his perpetual flashlight staff that they use to navigate Moria)