When the ring first falls out of the 55 gallon drum the close-up shows the 3 Greek letters (Omega-Zeta-Alpha) running diagonally across the faceplate, upper left to lower right. Later when Sidle is looking at it in a plastic bag the letters have changed direction and are now straight (horizontally) across the middle of the faceplate.
On the printout containing Christian Cutler's Department of Defense information that Catherine is reviewing, it lists Cutler as a E-5 Sergeant. However, the photo also on the printout is that of a U.S. Army General Officer. You can tell by the star on left shoulder and the flag of a U.S. Army General Officer in the background on the left.
Sara mistakenly says the name of one of the bots as "Slaughter 10" when it shows the bot's name as "Slaughterhouse 10," obviously a play on the name of Kurt Vonnegut's novel "Slaughterhouse Five"