Showgirls (1995) - 2 major mistakes

Deliberate "mistake": When Cristal and Zach's limo pulls up in front of the Club Cheetah, the Stardust is prominently displayed in the background at a close distance to the club. In reality, the Cheetah is a popular and well-known strip club in Las Vegas. People such as myself who have actually been there know that when looking at the Cheetah from the angle seen in the film, there would be no possible way the Stardust could be in the background (in actuality, the I-15 highway would be in the background, not the strip).

Audio problem: When Nomi is dancing at the Crave Club with the bouncer, she kicks him for making a suggestive comment and the bouncer stumbles backward into another guy on the dance floor. The bouncer tells the guy to "be cool", and the guy responds with "you be cool, buddy", but as we hear him say this, he's already punching the bouncer and his lips aren't moving along with the words.