Astronauts for such a longtime mission would be trained to know every aspect of the ship by heart, even if they were botanists or medics.
Also medical issues like waning eyesight would have been caught much earlier by the space agencies medical teams.
Personnel with so many personal, emotional and medical issues would have never flown on such a long mission like that.
Characters are seen communicating with no delay to the earth from both the moon and in space, to include audio and video. In fact, radio waves travel at 186,000 miles per second, and the moon is over 238,000 miles away from the earth. so there would be a short (1.28 second) delay each way if the transmissions were line of sight (which they were not, satellites would be used, which would add to the delay).
In contrast to this error, in Passengers (2016), communication to the earth from deep space was shown to take 19 years, with the earliest possible reply coming in 55 years.
In contrast to this error, in Passengers (2016), communication to the earth from deep space was shown to take 19 years, with the earliest possible reply coming in 55 years.
While the interior of the spacecraft has an abundance of handrails, on multiple occasions, it is quite obvious that the exterior of the spacecraft has no handrails. NASA has been using exterior handrails since Gemini XII in 1966 and Buzz Aldrin's very successful EVA. Tethers are not enough to ensure astronaut safety.
In several episodes, members of the Atlas crew are seen crying tears. However, tears would not roll down a person's face in a weightless environment, but form into watery spheres and float away--a dangerous prospect: they could float into, and short out, electronics.