In the end when they are telling all the ways the people were killed. In each ending they say one of the lady guests killed the maid, but if you listen when the maid is killed , there is a man's voice speaking to her before he murders her.
The whole reason why there was the change of voices when Yvette was killed was to confuse the members of the audience as to who committed the crime. In all the other murders, you don't hear anyone say anything, so they don't need to cover the voices up to keep you guessing. When Yvette is killed, the murderer speaks. If you listen closely, the voice who is speaking to her is first a man's, then a woman's. This is not a slip up, but merely a way to keep you guessing as to who killed her.
No, it's Yvette talking the whole time...her french accent is all fake, and when she is in the billiard room she is the one talking but her accent is gone. when she comes into the moonlight you can see her lips moving.
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