Continuity mistake: When Clark goes to pick up the blue lunch box next to his mom's picture, it shows his computer tower at his cubicle. On it above the red light, are two rows of 4 rectangles. Then it changes angles and now the first row of rectangles is thinner and more square shaped. Also between shots the extended gray space between the darker space where the rectangles are and the red light becomes thicker.
Picture added by Quantom X
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