When Det. Marsh's electrical system is restored on her vehicle, she makes little effort to check the inside of the vehicle before re-entering it. A highly trained police officer, especially a FBI agent, would have enough sense to check the back seat throughly before making any attempt to re-enter a vehicle considered suspicious.
When Marsh is describing how the killer penetrated her wireless network, she launches the "Horsez" game on her daughter's computer. The taskbar clearly belongs to Windows XP, but the window that pops up is styled like a Vista Aero window.
The movie takes place in 2008, as seen when the killer types the death dates of his victims. However, early in the film, after an Internet thief is captured, Jennifer Marsh says "Sunday is his father's birthday". She is referring to January 10, which was a Thursday in 2008.
When Jennifer is driving over the bridge, she is listening to the radio station AMR. The announcer says "Dominating the news again, here and across the nation, the increasingly urgent search for the Internet killer now known to be Owen Reilly of Portland." The newscaster should have said "alleged" internet killer.
In the motel room, the morning after Griffin's death, Marsh is showing Box a video clip in Windows Media Player. The main blue icon in the toolbar is a "play" button, instead of a "pause" button, which it should be if Media Player is currently playing back a clip.