When we were kids ,about 8 or 9 we first started noticing that in the old cowboy films,even if two cowpokes had been giving each other a right kicking ,they usually came out of it with not a hair out of place.We ,honestly used to think that the film makers must have been a bit simple.
Believe it or not,50 years later,the film and t.v. producers are still making the same stupid mistakes !
For example on "Spooks" tonight, the main male lead had a pemanent "5 o'clock shadow " no matter what time of day or the occasion ---and as far as I can remember, he's had the same facial fungus,exactly the same length,for weeks now----morning,afternoon and night.
You'd think with all the technical advances that 've been made and the fat salaries they get that someone might have spotted it.They perhaps did but don't think anyone'll notice.