I've done work in animation and I see this intentional imprecision as referencing back to analog stop motion techniques. Of course today they could manipulate the individual stills to perfectly align with each other and make the whole spot look more slick, but the point of the ad is to emphasize the manual individualization of their products by customers. You can see scratches and wear on a few of the laptops. The subtle shifting increases as the ad comes to its climax adding more motion to an otherwise still plane which, to me, cements the idea that this is intentional.