Two caveats:
1) I only saw it once, so I may have forgotten dialogue.
2) Again, there's a lot of stuff that was edited out of the movie. Movie Grace writes down something like "Always muscles?" on his whiteboard when he wakes up, and the one shot where he's sleeveless shows beefy arm muscles. The book explains that the Hail Mary traveled to Tau Ceti at 1.5Gs of ac/deceleration, and the med robot exercised them to compensate, but the movie skips over all that. That scene also shows movie Grace also has permanent burn scars over those arms - but in the final cut of the movie Rocky crawled back to his area on his own, so there's no movie explanation / reason for said burns.
In short, the final cut of the movie doesn't really detail Erid's specifics. When movie Grace opens Rocky's first message tube, the smell forces him to throw the tube in a chemical hood - book Erid's atmosphere is mostly methane at hundreds of degrees - but the movie doesn't go into why the contents of the tube are bad, nor are there any side effects when Rocky leaves his area as they leave Adrian. When movie Grace first goes up to the 'airlock' between ships, he's hit with 20 some atmospheres of pressure (which seems like it would do real damage to his ship even if it was human room temperature oxygen), but nothing is said about what type of gases those are.
On the gravity front, book Erid is ~2 times the gravity of earth, and book Grace points out arthritis is kicking in early between the gravity and everything they've gone through. The movie hand waves away gravity issues across the board, even having the ships spin around each other when the 'airlock' is being used to avoid filming those scenes in zero gravity... except the center of the centrifuge where the ships are connected wouldn't have any 'fake gravity' as a result!