Visible crew/equipment: When Slughorn stands before Tom Riddle speaking of seven Horcruxes, as the professor faces the fireplace and says, "This is all hypothetical," and when Tom replies, "It'll be our little secret," in these close-ups particularly the square lighting/reflector screen becomes clearly reflected in their eyes.Super Grover
Continuity mistake: In the dormitory, when lovestruck Ron is going gaga over Romilda, he is wearing a brown sleeveless tee shirt and its tan trim has many holes. When Harry brings Ron to Slughorn, Ron is still wearing that tee shirt, but now some of the holes are gone and the rest of the holes have changed position. (01:26:50)Super Grover
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