First, there was the Flamin’ Hot Cheetos biopic (complete with an Oscar-nominated song). Then came “Tetris”; “Air,” about Nike Air Jordan sneakers; “BlackBerry”; and “Barbie.”

It is, in other words, a golden age for product-origin-story movies.

The latest is “Unfrosted: The Pop-Tarts Story,” a satirical history that Jerry Seinfeld has expanded from his stand-up act. The film, which he directed and stars in alongside Jim Gaffigan, Hugh Grant and Amy Schumer, arrives Friday on Netflix. Unlike its predecessors, it’s not really concerned with actual events. Here’s what to know about the true history of the Pop-Tart — and what the movie gets right and wrong.

But first, how did Kellogg’s and Post both end up with headquarters in Battle Creek, Mich.?

You would think ground zero in the Breakfast Wars of the 1960s might be somewhere most people could locate on a map. But Battle Creek, Mich., was home to the Battle Creek Sanitarium, known for its water and fresh air treatments, and managed by Will Keith Kellogg and his brother, John Harvey Kellogg. W.K. Kellogg developed a method of creating crunchy pieces of processed grain for his patients (read: Corn Flakes), and one of those patients, C.W. Post, would go on to start his own company in 1895 selling several foods that were veeeery similar to those at the sanitarium.

W.K. Kellogg noticed Post profiting from his recipes and established his own firm in 1906, the Battle Creek Toasted Corn Flake Company. Within three years, it was cranking out more than 100,000 boxes of Corn Flakes a day, and, thanks to the success of Kellogg, Post and many other cereal companies, Battle Creek became known as the Cereal City.

The bumbling chief executive of Kellogg’s, played by Gaffigan, is fictional (thank goodness). On the other hand, Marjorie Merriweather Post — the General Foods owner whom Schumer portrays as a turban-wearing caricature — was one of the first female chief executives and, for most of her life, considered the wealthiest woman in America. (Today she may be best known for building Mar-a-Lago, now Donald J. Trump’s base.)

Did Post really come up with a toaster-prepared breakfast pastry first?

Yes. In the 1960s, Post, then the biggest competitor to Kellogg’s, invented a process of partly dehydrating food and wrapping it in foil to keep it fresh; no refrigeration required. The process was initially used for dog food, but it also allowed fruit filling in, say, a toaster-prepared breakfast pastry to stay both moist and bacteria-free. (And yes, it was actually Post’s idea, not one ripped off from a Kellogg’s employee via a hidden vacuum cam.)

Was the Post product really called Country Squares?

Unfortunately, yes. The name was later changed to its current Toast’em Pop Ups, but is that really much better?

How did Country Squares and Pop-Tarts end up hitting shelves the same year?

Post jumped the gun and unveiled Country Squares to the press in February 1964, four months before they were ready to sell, allowing Kellogg’s time to frantically rustle up its own, much-better-named version.

Did Bob Cabana really create the Pop-Tart?

Nope, the “Unfrosted” flack (played by Seinfeld) is fictional. The man who helped create Pop-Tarts was a manager named William Post (yes, really), who died in February at 96.

What was an actual rejected name for the Pop-Tart?

The ones in the film — Fruit-Magoos, Heat ’Em Up and Eat ’Em Ups, Oblong Nibblers, Trat Pops — are made up. But the real rejected name — Fruit Scones — wasn’t much catchier. The final name, coined by a Kellogg’s executive, William LaMothe, was inspired by Pop Art, the contemporary cultural movement.

Were Pop-Tarts really an overnight hit?

Yes, but the first shipment to stores sold out in two weeks, not 60 seconds, as in “Unfrosted.” Kellogg’s apologized, in advertisements, but this only increased demand. (They were restocked before long.)

Were the first flavors really unfrosted?

Yes. The original flavors — all unfrosted — were Apple Currant Jelly, Strawberry, Blueberry and Brown Sugar-Cinnamon. The first frosted ones — Dutch Apple, Concord Grape, Raspberry and Brown Sugar-Cinnamon — didn’t hit the market until 1967. (William Post came up with the idea, disproving skeptics who believed the icing would melt in the toaster.) The next year, sprinkles were added to some of the frosted ones.

Did Kellogg’s really advertise Pop-Tarts without a mascot?

It did, though the decision didn’t set off a Hugh Grant-led mascot rebellion, as in “Unfrosted.” Kellogg’s rectified the omission in 1971, introducing Milton the Toaster. (The little guy didn’t make it out of the 1970s.)

Which of these flavors are real?

The past few decades have been a smorgasbord of Pop-Tart flavors, some very short-lived. Can you spot the four real flavors here?

Chocolate Peppermint

Froot Loops

Guava Mango

Harry Potter Special Edition: Bertie Bott’s Every Flavor Beans, Popcorn

Maple Bacon

Twizzlers

Answer: Chocolate Peppermint, Froot Loops, Guava Mango and Maple Bacon Pop-Tarts have all been on shelves at some point. The Harry Potter Bertie Bott’s Popcorn and Twizzlers flavors remain the stuff of our fever dreams.