Cherry Saint-Saens, with plain fingernails, visits Banacek. She picks up The Boston Chronicle newspaper and, in the closeup of her hands holding it, her fingernails have red polish on them. When she puts down the newspaper and embraces Banacek, her fingernails are plain again.
For some reason the models remain at the exhibition hall after the exhibition is closed. When Felix goes there the brunette model is still in the Jaquzzi for no reason. And at the end during Banecek's explanation of the crime, the blonde model is still in the same dress as if she had never left the exhibition.