When Dr. Chakraborty is talking about Prot's vision, he describes him being able to see ultraviolet at 300-400 ångström. Generally in the context of vision, ultraviolet wavelength is ~280-400 nanometers or only 2800-4000 ångström.
Prot removes his glasses and lays them down so that the top of the glasses are laying on the table. Later, when Mark Powell rushes in, the glasses are lying right-side-up and facing opposite direction.
Every time Dr. Powell commutes home, a MTA NYCT A-Division (IRT) subway train is shown traveling on an elevated structure. The interior of the train, however, is an MTA commuter rail train (which is more likely to travel to the type of neighborhood he is shown living in).