Revealing mistake: When Mark builds his HAB greenhouse, he surrounds the growing area with sheet plastic. Later, when making his first attempt at lighting the hydrogen to produce water, there is a small explosion, which throws Mark back across the HAB. Given that an open-air explosion will produce a 360 degree shock wave, there should have been a noticeable disturbance to the plastic sheeting throughout the HAB, but the only disturbance we see to the plastic sheeting is the location where Mark is blown into it.
The Martian (2015)
1 revealing mistake
Directed by: Ridley Scott
Starring: Matt Damon, Jeff Daniels, Jessica Chastain, Kristen Wiig, Kate Mara
Other mistake: During the storm scene in the beginning of the movie, the astronauts' faces inside the helmets are brightly lit, meaning there's a light source pointed directly in their face. That's something that would render them mostly blind and unable to see and appears to be nothing but a dramatic effect for the camera. (00:05:00 - 00:08:00)
Mark Watney: Fuck you, Mars.
Trivia: When discussing "Operation Elrond", the Director says he wants his codename to be "Glorfindel." This shows he has read the book, as Glorfindel was cut out of the movie and replaced with Arwen.
Question: Why would NASA decide to send a botanist on a mission to Mars? A planet where no plants can grow.
Answer: Botanists going to mars can study the ground and the dirt so they could make life on mars. Botanists are also helpful due to oxygen in space, he grows plants on the spacecraft for the oxygen that they give off.
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Answer: Part of his job, aside from also being a mechanical engineer, was to use soil taken from Earth to Mars, mix it with Martian soil then grow seeds in it to see how Martian soil is for growing crops. This would be preparing for a longer term mission where growing full crops to feed the crew would be part of the mission.