The thing about movies is they’re super hard to make. They’re complicated. And if you’re someone staffed on a film set, odds are you might spend days, weeks, or months hammering out details on a film which in the big picture will be invisible to the audience.

But not invisible to the people on r/MovieDetails – they thrive on the minutia. Here are just a few gems they’ve uncovered!

13. Troy (2004)

Brad Pitt and Eric Bana made an agreement to owe each other small amounts of money for each accidental hit on set during their fight choreography.

In the end, Bana owed nothing, Pitt owed $750.

12. Harry Potter and the Order of the Phoenix (2007)

It’s notable that Ginny is the only girl in the photo wearing pants instead of a skirt, likely a nod from the costuming department that she’d be in boys’ hand-me-downs.

11. Interstellar (2014)

The way they modeled the black hole was so complex that it took 100 hours of computing time to render each frame.

10. Indiana Jones and the Last Crusade (1989)

Everyone with a flower in their lapel tried to kill Indy.

He then marks Elsa with one.

9. The Dark Knight Rises (2012)

Bruce is the only person at the masquerade not wearing a mask.

Batman is his true identity, the maskless Bruce is the facade.

8. Charlie and the Chocolate Factory (2005)

The toothpaste brand Smilex is a nod to Smylex, the company that creates poisonous gas in one of Tim Burton’s other movies, Batman.

7. The Wizard of Oz (1939)

Terry the dog (“Toto”) was paid more than the actors playing munchkins.

6. The Empire Strikes Back (1980)

“I am your father.” wasn’t spoken on set during the shooting of the scene.

It was dubbed in later along with the rest of Vader’s dialogue.

In order to keep the secret, the line as performed was “Obi-Wan killed your father.”

Only Mark Hamill knew what it would really be.

5. Rango (2011)

Rather than motion capture, animators used footage of the actors playing their parts live as detailed reference.

4. The Incredibles (2004)

Director Brad Bird had Spencer Fox (Dash) run laps around he studio in order to sound convincingly out of breath.

3. Scream (1996)

The phone Drew Barrymore was using to dial 911 had been left plugged in by mistake for a few takes.

The police called back to ask what was going on.

2. Inglorious Bastards (2009)

Colonel Landa subtly but repeatedly checks the pulse of those he’s interrogating in order to gauge how nervous they are.

1. Pirates of the Caribbean: Dead Man’s Chest (2006)

Mackenzie Crook wore two contact lenses on top of each other to pull off his character’s wooden eye effect.

“It’s uncomfortable,” he said, “but not painful.”

There’s more than just loads of money happening behind the scenes of these iconic flicks!

What’s your favorite movie factoid?

Tell us in the comments.