That separation of roles is actually the source of a lot of errors of this sort, not something that could have potentially prevented them; the penciller's composition is ambiguous, the inker wildly misunderstands what the penciller is going for, the colourist compounds the inker's errors by slapping down the first colours that come to mind, nobody involved has time to communicate with anybody else because the deadlines are unreasonably tight, and they're all so underpaid and overworked that nobody gives a shit anyway, and before you know it, what was probably intended to be a panelled wall, a towel rack, and a mildly interesting pattern on the linoleum becomes a door behind the bathtub, a levitating shower curtain rod, and a rug that extends under the toilet.