Here's one: stars. Why are they always so visible? In exterior shots, the lighted hull of the ship should necessitate small exposure times, not allowing the comparatively dim light of the stars to register on the film plate. This implausible scenario of stars being so obvious only applies ten-fold to very bright shots inside a ship, when, if anything, stars are often brighter still through the ship windows! Then again, maybe we're meant to imagine this as all having been documented by some as-yet-unknown technology that automatically compensates for differing light levels according to intelligent object recognition, and what the documenteur desires to be shown.