Back in 1993, Jurassic Park's dino special effects were considered revolutionary, and even today, they put most blockbusters to shame. And aside from the obvious uses of computer wizardry, the movie boasts several small, unnoticeable tweaks here and there that smooth out some rough edges.
Shortly after the famous kitchen scene, Alan Grant and the gang are forced to crawl through an air duct in order to escape the clutches of a vicious velociraptor.
At one point, one of the kids - Lex - falls through the ceiling when one of the metal panels she crawls on is busted in by a raptor. Here, she dangles in midair as she clings onto another metal panel, at which point a clear shot of her face can be seen.
But this isn't actually the actress who plays Lex, Ariana Richards.
A stunt double was used for this shot, and when the double accidentally looked straight into the camera, Spielberg and his crew were forced to digitally add in Richards' face to rectify what would otherwise have been a blatant mistake.