While posing as Grace's lawyer, Everett Lynch's wig changes color repeatedly, from gray to dark brown and back again.
When the third victim is found, an alert from DC Metro police appears on Garcia's computer. However, this victim (and the two previous ones) was found in Baltimore County; this is outside of DC Metro police's jurisdiction.
JJ is an experienced field agent. She would know that the handgun on the ground in front of her poses zero threat compared to the two perps she has at bay. She would not worry about securing the gun until the suspects were contained and secured, and she had called for back up.
The victims, who were lured via a dating website, are responding to another male's contact. This means they were homosexual. But no mention of this is made during the course of the investigation.