Downstairs, Martin Crane's elevator has three walls on it. Upstairs, it is a simple platform. We know it's supposed to be the same elevator because his chair is the center of it, but it doesn't match.
Chapter nine: Despite Mace's truck traveling at a high speed and a mile or two, the odometer reading does not change.
Near the end of the first chapter, the Masked Marvel falls off a large fuel storage tank onto a canvas-top truck parked on the ground below. The stunt is "performed" by a dummy, whose hand catches on a bracing girder along the side of the tank, ripping its entire arm out of its coat sleeve.
The Masked Marvel tells Alice via a recording that only she would know his real name with Crane, whom we know from the start that he is in league with Sakima, present, yet nothing was done to capture her to make her reveal his identity.