The fidelity of the props to the setting of Japanese Empire in Korea during the late 1930's is actually quite impressive. However, one detail kept cropping up over and over, and that is the intravenous (IV) equipment. What I see are spiked drip chambers using clear plastic and topped by white plastic spikes. Plus, the fluid runs through clear IV tubing regulated by white plastic roller-type flow regulators.
These did not exist in the '30's.
The standards of the time utilized rubber "surgical" tubing, metal thumb clamps, and rate controlled by eyeballing fluid volume administered over a given time, such as 4 ounces per hour. This would be read off of a scale printed or cast molded onto the side of the bottle.