Project Hail Mary's "Science Mistakes"

TL;DR

Most 'science mistakes' in Project Hail Mary reveal that viewers only notice errors in their own field of expertise, not objectively bigger physics blunders.

Key Points

• 1.The unbalanced centrifuge was the most-cited mistake. Ryan Gosling's character places two vials on the same side of the centrifuge, which any molecular biology freshman is drilled never to do, yet the ship may have had a self-balancing centrifuge.
• 2.Every expert spots only their own domain's errors. Linguists hated the alien communication logic, electricians flagged the wire-yanking scene, teachers noticed Grace filed no substitute plans — each group blind to the others' complaints.
• 3.Rocky breaking the Xenonite barrier should have killed Grace instantly. High-pressure, 200-degree ammonia gas flooding the cockpit would be fatal, yet this far larger physics violation pulled almost no one out of the story because of the emotional momentum of the scene.
• 4.The traffic-cone puke gag has the same physics flaw as the centrifuge. Traffic cones have holes on both ends, so puke should exit the other side — identical to the centrifuge force problem — yet audiences accepted it because it was comedic, not a 'science object.'
• 5.Relativistic time dilation explains the apparent four-vs-eleven-year contradiction. Grace's trip home takes four years of his subjective time but eleven years pass on Earth due to near-light-speed travel compressing time for the traveler.
• 6.Astrophage not being bred for a return trip is a logistical choice, not a science error. Millions of lives were at stake per week of delay, so engineers simply deprioritized the three astronauts' survival — the fuel existed but building a breeder wasn't the mission.
• 7.Adrian's green sky and Rocky's radiation ignorance are defended as plausible worldbuilding. A sulfur-rich biosphere could produce a green sky, and different evolutionary tech trees could legitimately leave a species without a concept of electromagnetic radiation despite advanced material science.
• 8.The film's emotional core — not its science accuracy — is what resonates. Both the host and his wife cried throughout; the story's power comes from characters sacrificing themselves for one individual they love as much as their whole planet, making the centrifuge quibble feel trivial by comparison.