This is what you want to do sometimes to your continuity mistakes:
Every film has them; I’ve never watched one that didn’t. Of course the larger the budget, the fewer mistakes there should be, because technically you can afford to work with the best in the business. It is however inevitable to make mistakes since we are only humans. We see continuity mistakes in Over Lunch and want to shriek. Mainly because to avoid them, we had to throw out some really good takes altogether.
People say that the perception of watching something for the first time is skewed by the large amount of concentration that goes into just hearing what is going on. Our ears can’t hear the mistakes and since sound is perceived faster than image in our brains, we are tricked into seeing what we hear. The minute you see the same film two or three times though, you really start focusing on the surroundings and that’s when you see all the continuity mistakes. Same extra walking around 3 different scenes, or the hair is behind the ear on one take and in front on the next take, or the glass went from full, to half empty, to full again all in the same scene.
The thing is, sometimes a 5-minute scene in a movie is shot within three different days, or even with a 2 or 3 week-break between it, like for example, the actor “going through the door” is shot on location and then 6 days later the “coming into the apartment” is shot in a studio. So under pressure, it’s understandable that the last thing on people’s mind is: was the last button on his jacket undone?
So if you are thinking of shooting a film, make sure you keep your continuity mistakes to a minimum by working with an experienced script continuity professional and listening to him or her, no matter how annoying that may be in the middle of a shoot, and when dealing with extras, take the time to choreograph those movements well, otherwise you’ll be pulling your hair out like us by the time you start editing. Unfortunately, baldness does not suit everyone.