When Michael pushes Sara out the door and then hits the ground to avoid being hit by the snipers, the bottom of his shirt lifts up as he is crawling away and we can see that there are no tattoos underneath his shirt.
At the end of 'Riots, Drills and the Devil: Part 1', there was a small hole in the center of the window on the door into where Sara was hiding. In this episode, to start with there is no hole in the window and later in the episode, the hole is back but in the wrong place.
Micheal says holes will be have to be drilled at the tip of the devils horns, the eyes, the nose, tip of the fangs and end of the braids. When we see Sucre drilling at the fangs two holes at the eyes are clearly visible, but there is no hole at nose. Meaning either the film team forgot about it or it's deliberate, implying that Sucre forgot about it. Either way the wall should at the very least be more difficult to bring down when the drilling is done.
When LJ's mom is telling him to not make a scene while LJ is watching the Fox River prison riot on the news into the episode. In he pane of glass on the entertainment center you can clearly see the cameraman.
When Nick and Veronica are supposedly in Washington DC on the corner of Constitution and 11th, they are actually still in Chicago. A CTA bus goes by and they are outside of the Kluczynski Federal Building.