Throw It In/Playing With

Basic Trope: An actor improvises/screws up a line or scene, which eventually goes into the final product.
 * Straight: In a scene of Legend of the Ancient Trope, Daniel is supposed to tell Lord Evulz he is a dangerous fighter, then draw his sword. However, Daniel's actor draws the sword too quickly, and ends up flinging it offscreen. The director decides to keep it in, pretending it's a comedy scene.
 * Exaggerated: The entire movie is improvised by the actors.
 * Justified: The flub puts more emphasis on the fact that Daniel is a horrible fighter.
 * Rule of Funny / Rule of Cool
 * Subverted: The director says he'll keep it in, but a while later decides against it and orders a proper take of the scene.
 * Double Subverted: But he goes and puts the flub in anyway.
 * Zig Zagged: ...and then removes it when test audiences react negatively.
 * Inverted: In a movie that is entirely improvised, Daniel's actor speaks a pre-written line that gets into the final cut.
 * The director suddenly tells the actors not to use a particular line from the script.
 * Deconstructed: ???
 * Reconstructed: ???
 * Invoked: ???
 * Enforced: Daniel's actor is told to improvise whatever feels right.
 * Lampshaded: "Wow, didn't expect that..."
 * Defied: The director orders the scene to be shot properly.

"Hey, that wasn't in the script! ...Ah well, Throw It In."