From a global perspective, the most important flaw is the key hidden under the carpet on the floor? Tony ignored his instinct and thought that the killer would hold the key until the moment he left, so instead of checking it when he got home, he put the killer's key in his wife's bag.
But from a local point of view, this film also has many unrealistic
1. The husband put the key so deliberately, and the other two people didn't notice it?
2. The detective's coat is the same as her husband's, but I didn't notice it?
3. The key? It should be different.
4. The smell of burning scarves should be more choking.
I have to say that the script of this old movie is quite good, and the constant reversal is very exciting, but the detective has always suspected that her husband felt that the intensity of the reversal has been greatly weakened, making people feel that the result is known and the process is pushed forward.
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