I have a mixed reaction to a hard-SF show like The Expanse. On the one hand, it's deeply refreshing to finally see a TV show that's trying to be scientifically accurate in its portrayal of space, the way I try to be in my own writing. For the most part, it does quite well with that. On the other hand, because it is trying to be accurate for the most part, I hold it to a higher standard of plausibility than I do with most shows, and so the few things that are still implausible just grate at me.
My main problem is one the show's producers really can't avoid but that still distracts me, which is the way they have to fudge weightlessness while filming in the Earth's gravity. The whole "magnetic boots" dodge is scientifically ridiculous. Magnetic boots would screw with a spaceship's sensitive electronics, and spacecraft aren't really made out of magnetic materials anyway because they're too heavy, and it's so much easier to maneuver by floating in freefall and pulling on handholds. Using magnetic boots to move in space is equivalent to trying to swim by strapping lead weights to your ankles and walking on the bottom of the pool. It has no advantages to people actually operating in space -- only to Earthbound filmmakers trying to pretend their actors are in space. Honestly, given that the show already posits an advanced, high-acceleration space drive to enable its ships to travel from world to world quickly, I wish they'd just posited that the same principle behind the Epstein drive also let them generate artificial gravity. It wouldn't be any more implausible than the magnetic-boots thing, really.
The other small thing that bugs me is the failure to design props with microgravity in mind. The characters use standard soda/beer cans and bottles that would never work in microgravity, and the main starship set includes a drip coffeemaker that could cause a medical emergency if the drive ever shut down while it was operating.
