Continuity mistake: Finch runs into the girl's bathroom when the laxatives affect him. He tries to take out a toilet seat cover, but there are none left. The side shot shows a corner of the box hanging down below the dispenser, whereas when the shot changes to the front, there is no visible corner. It then returns to the side and the visible corner, and back to the front with no corner.
Picture added by Lummie
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