As Rossi and the sheriff walk onto the porch of the Wilkinson widow, a camera can clearly be seen on the right side of the screen.
As Hotchner, Reid, and Jareau are driving toward what is supposed to be the Chancellorsville Battlefield Park in Virginia, they round a curve and face a steep hill covered with scrub vegetation. There is no hill or similar terrain like that in the vicinity of the Chancellorsville battlefield, and the scrub vegetation on the hill is characteristic of southern California, not central Virginia.
Rossi speaking to sheriff Caufield after their unsub was killed by his wife mentions his unsolved case was 21 years old yet in Criminal Minds : Damaged he's having nightmares on the 20th anniversary of the case .