All too often for a story, continuity is sacrificed for the story. Or perhaps it is just ignored. Maybe it's just me, but there are so many places where these things just fall through the cracks that it's getting a bit ridiculous.
In the television show Continuum, an early episode sees the character Kiera tell Alec (future employer/friend/mentor/whatever) that even the simple things, like eye shadow, will be so much simpler, because they are dispensed in a "dose" by an applicator in the perfect amount. Yet later in the season, we see said applicator, and as the makeup is applied, she has to move her hand from left to right (or perhaps right to left, since the shot involves a mirror).
This would imply that if she did not move her hand, the applicator would not apply the "perfect" amount. That means that it's not unlike today's airbrush makeup. Now it is true that those applications are probably more limited to certain markets, such as the entertainment industry, but it shows that while a neat piece of technology may exist, it isn't as described initially, and we are left to ignore the continuity error. This is also certainly not the only example.