Captain America: Civil War is out on Blu-ray today, so if you passed on the earlier Digital HD release in favor of physical media, you can finally bring the movie home. I suffer from impatience and a compulsion to have all Marvel movies on my Blu-ray shelf, meaning Marvel Studios and Disney get my money twice. Having been through all of the special features via the iTunes release, I am happy to report Captain America: Civil War is perhaps Marvel’s most robust home release with special emphasis on the outstanding commentary track by directors Joe and Anthony Russo and screenwriters Christopher Markus and Stephen McFeely.

The Russos, Markus, and McFeely share all kinds of interesting facts and insights regarding one of the best-reviewed and highest grossing superhero movies ever. This article will go through ten of the most interesting highlights from the commentary track, but it’s so good that choosing only ten proved to be impossible without getting upset at ten more that I had to leave off the list. That’s good news, though, as I won’t be spoiling the entire commentary track, nor will I be hogging all the good moments before you even listen to it, which you really must do.

A couple of the points not on this list are so meaty that I’ll be chewing on them in longer editorials later this week, but for now, here are ten of the very best highlights from the Captain America: Civil War commentary.

10. The Mind Crown

Sometimes the simplest solution is the best one. That was definitely the case for the little red book and its ten phrases that cause Bucky (Sebastian Stan) so much trouble in Captain America: Civil War. It was a simple, effective device to demonstrate just how far gone Bucky once was and may still be.

Though the red book proved to be the best idea, it wasn’t the original call. Before the winning idea arrived, the device that would control Bucky was the Mind Crown, which is the piece of equipment you see attached to his head when his memories are being wiped both in Civil War and its predecessor, Captain America: The Winter Soldier. Christopher Markus describes the process in the commentary.

“We also danced around for a while, in terms of a McGuffin, this red notebook ‘cause I think we wanted to connect it more to what you’re watching right now, which is his sort of brain control chair from Winter Soldier, that there were many drafts where they were chasing something called the Mind Crown, which was basically that thing that goes over his head and then somebody very wisely went ‘couldn’t it just be like a notebook with some words in it?’”

No character could have been happier to see the Mind Crown replaced with the red book than Zemo (Daniel Brühl). Can you imagine him having to get that machine inside Bucky’s holding cell in Berlin? The book was a far more effective and convenient solution for the film’s antagonist.