Unless the movie is actually titled “The Hangover” most young professionals (and all veteran cops, newspaper reporters, burned-out lawyers and bounty hunters) can drink copious amounts of booze until 4am, then get right back up at 6am and hit the mean streets after a 30-second shower and then chugging a cup of black coffee, usually with a big glug of Irish whiskey poured in for good measure…
Even in jungles, in third-world jails, while being held captive by kidnappers, on desert islands, while camping, and while stranded in the past. Women also have their make-up tattooed on, because it never budges or comes off on anything or anyone (unless it’s a plot device) and they wake up with it on.
Possibly the only redeeming element in the Dukes of Hazzard movie was the bit during the end credits where they showed what actually happens when a car launches off a ramp high into the air and comes down flat(-ish) on a hard surface. They went through a lot of cars for that shot.
Drivers never reverse park.
If you hit a trash can, its ok - no trash will spill out and your car won’t be scratched and the trash can angels will put them back
Car tyres ALWAYS screech, even if you are not in a hurry.
If you talk to your car nicely, it will hear you and start
If an SUV is driven by the bad guys it will have a magic engine and defy the laws of physics - it can keep up with the high performance sports car without a problem.
You can always get away from persuers by pulling into an alley and turning off your lights. (note - I have actually done this)
And whatever makeup and hair styles are “on” at the time the movie was made will be fashionable in whichever location/time period the story takes place on. (There are exceptions, but it isn’t uncommon to see period pieces in which, for example, the lords and ladies follow the fashions of the time, but the ladies’ makeup definitely does not, and the peasants’ haircuts are… best left unexamined).
Then again, medieval peasants and Roman slaves had glow-in-the-dark teeth…
And on all types of surfaces, including sand. If a hero is hydroplaning on wet asphalt, his tires will still screech.
If you discover an evil conspiracy, the first person in authority you confide in will turn out to be part of the conspiracy, and try to kill you.
Nightclubs are very picky about their clientele. Thuggish doormen decide who gets to go in based on whether or not a person is cool enough.
And if that Person In Authority asks “Does anyone know about this besides you?”, the other person is obliged to answer “No”.
It’s a mandatory part of the ritual, right before the Sacrifice of the Innocent.
And when it is a plot device, it’s always multiple jet black streaks of mascara running down her cheeks.
That was one thing I liked about Deadwood. Some people had nice white teeth, but many characters had nasty yellow crooked teeth. I’d love to know how they did that.
Surely all Americans know the answer - they used British actors 
Combo of casting and sleeves. One of my college students (in the US) was the Spain-born son of two artists, an American and a Spaniard; his teenage rebellion had taken the form of joining the army, and he’d been set to work as a dentist’s assistant. He’d been absolutely shocked when, after 18 years of a middle-class (if bohemian) existence in Spain and of visiting a dentist much more often than his classmates, and going to Grandma’s to cousins with equally-dentist’ed teeth, he started encountering people his age with cavernous mouths, recruits from depressed areas.
People who want to become professional actors in the US are highly likely to have invested on a dentist, but it still should be perfectly possible to go to the local SCA, colleges or one of those agencies who specialize in (for example) “real gangstas playing gangstas”, and find your share of crooked teeth.
See #8.
If set in Boston, the establishing shots are of: Prudential Building/Hancock Tower, “salt and pepper” (Longfellow) Bridge, MIT dome, Fenway Park, State House
Black judges are particularly intolerant of any “wisecrakin’” or “tomfoolery” in their courtrooms.
Black sergeants spend 80% of their day yelling at that one cop who doesn’t play by the rules and/or seems to commit too much property damage. White sergeants are your buddy and/or the evil mastermind behind everything.
If there’s a group of 4 white kids, the 5th one will be black.
If there’s a group of 4 white adults with 1 black adult, the black adult will die first, unless that black person is Ice Cube or particularly good at killing zombies.
Black people have absolutely no sense of humor, unless they are paired with a white/asian person, in which case the black person does nothing but tell jokes or make funny voices.
That dogs can’t look up.
Dogs CAN look up. But the old rifle displayed over the pub, covered with years and years of smoke from pub goers, is definitely still in working order.
When the lonely, depressed divorcee finally decides to go out looking for company, there will always be an archetypal “singles bar” nearby and there will always be attractive women sitting alone at the bar awaiting said divorcee’s advances. Whether or not he is successful depends on the screenwriter’s desired plot line and character development.
When the divorcee is a woman, she will go to the same bar, hook up with a charming serial killer, and be brutally murdered.
When one person is fighting a group of baddies, they will only attack him one at a time, while the rest of them dance around threateningly, patiently waiting their turn.
European aristocrats from the 18th century never have smallpox scars.
A body hanging from a noose will stay there indefinitely, even when it has decomposed to the point of falling apart.
A ten-year-old boy can beat up a fully grown adult, provided that the ten-year-old is really, really good at karate.
A medieval archer can shoot the antennae off an ant with an English longbow.
An evil overlord’s henchmen will ALWAYS serve him, out of loyalty (never fear), no matter how terribly he treats them. If he betrays or tries to escape from the evil overlord, it will be because he too is a manipulative, evil bastard.
Heroes always speak with American accents. Villains always speak with British ones.
Everyone in the UK has a perfectly understandable accent and will sound like a BBC anchor, no matter what part of the UK they’re from. The only “low-class” accent will be a charming (yet still understandable!) Cockney one.
Modern Egypt and its government has the same belief system that ancient Egypt had. Also, the Star of David was the symbol used by Jews even before David himself was born, and would thus be recognizable to ancient Egyptians.
Peoples in ancient civilizations routinely wore black and purple garments–and they will be ENTIRELY black and/or purple, not just a single stripe. Also, sequins.