The couch-bed in Titanic
You’ve probably seen Titanic before, and if you haven’t, you’ve watched it more than once. There’s no shame in admitting that. Everyone probably recalls the “draw me like one of your French girls” moments, but there was one scene that was both a mistake and pure gold.
Jack tells Rose to pose for him “over by the bed” before quickly correcting his statement to “the couch.” There was no bed in sight, but his use of the word “bed” definitely had a hidden meaning to it. So, instead of redoing the shot, James Cameron left it in the final cut.