Everyone walked out of Road House into the sunlight feeling stunned, stupid, a little gay for Patrick Swayze, and wondering idly why they ever thought Duran Duran was a good band. In one day, the 80s were over. Women's hairdos started to make sense once again. Spandex was abolished. The New Kids and Wham! were purged from our cultural memory.
Alternately, there's a 'Trivia Track' on some versions of the DVD.
Artistic License - Biology: There is a sex scene involving Swayze's character, Dalton, and his love interest (played by Kelly Lynch) that reveals that either Swayze's package is located somewhere in the vicinity of his belly button, or else Mr. Swayze is a very, very fortunate man.
"All you have to do is follow three simple rules: One, never underestimate your opponent. Expect the unexpected. Two, take it outside. Never start anything inside the bar unless it's absolutely necessary. And three, be nice."''
Beware the Nice Ones: For someone who can (and does) rip someone's throat out with his bare hands, Dalton is actually a really nice guy. A good example is when he pays the owner of a restaurant to allow a homeless guy to sleep there for the rest of the night.
He also encourages politeness among the other bouncers working under him, telling them to "Be nice! It's nothing personal."
Chekov's Gun: Ketchum's knife. Pulled from Wade's corpse by Dalton, it's used to pin down the accelerator on his car, and recovered by Ketchum. He uses it later in an attempt to kill Dalton, who manages to get the knife away from him and kill him with it.
Death by Looking Up: Wesley's sole surviving mook gets conked out by a stuffed polar bear which topples. Rather than step out of the way, he screams and fires his gun at it. (He doesn't actually die, though.)
For the Evulz: Brad Wesley's actions all seem to be justified—if at all—by, "Because I can."
Originally his motive is keeping all the businessmen cowed and paying into his town-wide protection racket; he can't afford to let any of them start bucking him by doing things like firing his nephew. He loses it and makes it personal after watching the woman he was obsessed with having sex with Dalton on the barn roof across the lake one night.
Freudian Slip: Wade Garrett's mispronunciation of "Double Deuce".
Taxidermy Terror: Tinker, the only survivor among the Big Bad's Mooks, is so freaked out by the various stuffed animals surrounding him that he can't testify to the Sheriff about what happened in the climax.
The Worf Effect: Despite showing himself as a badass bouncer, Dalton gets in big trouble trying to take on Wesley's mooks, simply so his friend/mentor Wade Garrett's own badass bouncer credentials can be established.
Xanatos Roulette: Brad tries to force Dalton into making a Sadistic Choice, but he was clearly prepared to kill Wade. He also knew how Dalton would react, knew when Wade would recover from his initial beating, and how long it would take Dalton to head off to check on Dr. Clay so he could finish off Wade.