Continuity mistake: Clark is packing things from his cubicle when Perry first speaks to him. In the first shot of Clark, you can see the items on the desk of his cubicle, mostly the computer, which is very near the edge. When it cuts to a close up of him putting stuff in his bag, a cup full of pencils and pens appears next to his computer. Then as he is setting down the picture of his mother, the cup has more in it, and the things hanging on the wall of his cubicle change.
Picture added by Quantom X
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