Ideally, filmmakers would create perfect movies on the first try. This doesn't always happen, though. Even major franchises with star actors and directors may need to film scenes again. However, reshoots aren't always bad news. They don't necessarily doom the final project. In fact, cinematic history is littered with famous movie reshoots. Some edited movies tank, but there are a surprisingly high number of movies saved by reshoots.
Many films go through some sort of reshoot process, and sometimes that new footage makes for the best part of a movie.
There are quite a few notable lines and moments in Tommy Boy, especially when Chris Farley sings about a "fat guy in a little coat." Originally, Farley was only supposed to say the memorable line over and over, but he got bored during a take and started singing it.
The producers loved his musical rendition. When the scene needed to be reshot for technical reasons, they made Farley belt it.
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For all of the exciting moments in Rogue One: A Star Wars Story, there's one scene that clearly stands above the rest. Darth Vader's beautiful and terrifying slaying of Rebel soldiers near the end of the film is as memorable as anything in Star Wars - and it only exists because of reshoots.
Rogue One had a myriad of production problems. At one point, a new director came in and changed the film to align more closely with what Disney and producer Kathleen Kennedy had envisioned. During these rewrites, the creative team came up with the incredible Darth Vader scene that ends the film with a bang.
In the first version of Rocky, the crowd carries the title character from the ring after he loses to Apollo Creed in the big fighting match. Then the boxer finds his way to Adrian. The filmmakers thought this ending was too cheesy, so they spent money they didn't have to reshoot the scene.
Instead, Adrian fights her way to Rocky while he continually calls out her name. The result is incredibly evocative.
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Generally, Thor: The Dark World is seen as one of the lesser MCU films. But it's still a Marvel movie, and some of its moments are great. Loki is a highlight, and it's especially hilarious when he mocks Thor by showing off his ability to shapeshift into any Avenger.
That scene came about because of Joss Whedon's reshoots. Whedon punched up many sequences in the film.