In the asteroid scene, one of the asteroids is actually a shoe. The rumor is that George Lucas asked the SFX people to redo the scene so many times that they got annoyed and one of them threw in their shoe. Another of the asteroids is actually a potato
Star Wars: The Empire Strikes Back (1980)

In the scene where Leonardo DiCaprio’s character Calvin Candie smashes the palm of his hand on the dinner table, the actor broke a glass under his hand and really began to bleed. DiCaprio ignored it, stayed in character, and continued with the scene.
Django Unchained (2012)

 The film’s opening sequence shot in Adana and Istanbul in Turkey took around two months to film, three months of rehearsals, four months of preparation, 200 crew members from England and another 200 local crew in order to produce around 12-14 minutes of screen time.

Skyfall (2012)

Christopher Nolan would use toy cars to help plan chases and stunts.
The Dark Knight Rises (2012)

Charlize Theron found herself struggling during her action scenes due to her smoking habit.
Prometheus (2012)