Going Under - S4-E15
Continuity mistake: Michael is discussing a bargain with Sara but when he first draws it out it's in squares, then when the clipboard is lying flat on his stomach the letters are circled.
Going Under - S4-E15
Revealing mistake: Sucre and Linc are driving to the pier and there is a shot looking at their SUV. In the background you can see a cop directing traffic away from the shot. It's fairly obvious.