Reuben, like the sandwich.

Stratt hires a climate change scientist and then nukes Antarctica and paves the Sahara desert and the scientist just sobs

Rocky calls Grace a leaky blob

Rocky thinks humans are crazy for doing EVAs

Stratt gets sued by Everyone for plagiarizing Everything

Grace gets scurvy

Grace drags Rocky back into his habitat after Rocky saves him, and he gets really bad burns from coming into contact with Rocky's atmosphere

Grace also power washes Rocky, but we don't talk about it

Rocky was orbiting Tau Ceti for 40 years before Grace came along

Rocky has anxiety about oxygen after he gets lit on fire by Grace's atmosphere

Rocky also has anxiety about Grace using the centrifuge because of how it almost killed him that one time

Grace also pulls that maneuver a few more times and repeatedly passes out (at least he doesn't get crushed by a metal chair after the first time, though)

During the confrontation with Grace and Stratt, Stratt calls Grace a coward and Grace says that Stratt is murdering him. Just much more aggressive language all around

Grace doesn't lose his memories from the coma; Stratt injects him with memory altering drugs. Her hope was that by the time he remembered, he'd either already be done, or he'd be in too deep to stop

Eridians don't know about relativity, which is said in the movie, but in the book Rocky talks about how he was basically running the ship alone with a faulty trajectory and STILL managed to make it to Tau Ceti

When taumoeba leaks into the Hail Mary's fuel, Grace immediately dismisses the possibility of Rocky's boxes failing because Rocky is such an incredible engineer

When Grace and Rocky separate, Grace does loser amounts of math to figure out how long he'll be able to see Rocky's ship

When Grace does something stupid, Rocky forces him to take a nap to be less stupid

Rocky doesn't have a voice, Grace just learns Eridian by using his laptop setup

Grace gets arthritis at the end from Erid's intense gravity

Grace also gets a slew of other diseases from malnutrition

He survives by eating taumoeba until the Eridians can figure out how to feed him

The Eridians feed Grace by synthesizing human meat. Grace calls them "me-burgers" and they're his favorite food

Rocky's blood is mercury and he eats toxic heavy metals

When Grace teaches Rocky about radiation, he gets Rocky to cover his side of the tunnel in astrophage to protect him. Rocky tells Grace to do the same, but Grace just lies and says that humans are immune to it. On the inside, he thinks that it doesn't matter if he gets cancer because he's going to die anyway :(

Rocky's ship is the first actual spaceship Eridians ever made. Rocky has to fix so many things on the way over, because they just have no experience with space travel