It's a curious testament to the power of moving pictures that you have to strain to remember that in reality, people walked at a normal pace back then. The population didn't skitter about like restless insects. If the 20s had actually unfolded at the speed they appear to in archive footage, the decade would've ended early, somewhere in the middle of 1925, thereby causing a five-year "time gap" during which everyone would have to stand perfectly still for fear of creating an "event" that might burst the bubble, sucking in all the neighbouring matter in the universe. Or something like that. Ask Doctor Who, he's the expert.