When Benson and Stabler are filling Captain Cragen in on the assaults across the country the victim's photos are displayed on the map behind them. After Benson tells Cragen that the women have been terrorized for over 20 years the camera cuts over to Stabler and the photos are no longer displayed.
While in Detroit and Chicago, Olivia Benson is wearing a belt with a rectangular buckle; however, when she arrives in Los Angeles shortly afterwards, she is wearing a different belt with a round buckle.
Olivia comments to the ADA that she wishes they could charge Harris with more than just the most recent rape to Vicki. There would have been an easy way to do that: turn the case over to the FBI. Harris raped multiple women in at least four different states, and he crossed state lines to continue raping Vicki, which makes this a federal case. Whenever someone crosses state lines while committing a crime that means the case falls under federal jurisdiction. Considering that first degree rape has no statute of limitations at the federal level the feds would have been able to put Harris away for life.
When Benson and Stabler are viewing the web page profile of William Harris, a typo is seen in the first sentence. It reads: "...William Harris has build a reputation on providing exemplary customer service."