Olivia's hand holding the female victim's passport, revealing her French nails, which is out of character for her. They disappear in the scenes after that.
Stabler and Benson search the female victim's rented room without gloves on. They also pick up the burned evidence from the barrel before it was photographed and processed by the crime scene techs.
When Warner tells Benson and Stabler that the killer cut out and took the female victim's breast implants Olivia says "how do you know he had those?". Surely she meant "she" not "he".