Please check my answers, and give me your input. This is from the movie charade.

Why would you hold a mirror up to a dead body? To see if the person is still breathing

Are the murders anatomically believable?
I do not think the murders are believable because they do not allow the viewer to see how they kill the victim the camera all of sudden shows the scene. However, on some parts where the murderer uses the gun it appears real.

How is it possible to die from a fall such as the one in the theater?
Because their was a huge gap between where he was and where he landed on the ground.

If the movies were made today, what scientific challenges would they face that they did not face in 1960?
For example, when Herman falls from the American express and he comes back to life or when he drowns.