Yesterday, I complained about the villain in Frozen. I like the movie and the villain, but the villain's monologue (which explains the evil plan) is not as thorough and comprehensive as I would have liked it to be. The villain doesn't have enough time to explain every aspect of the plan; it makes me feel like there are some places where the evil plot could have been improved.
This happens sometimes in the Nancy Drew series, because the villain is usually revealed at the very end. For example, the culprit in The Haunted Carousel doesn't explain about the attacks on Nancy's life, and the culprit in Warnings at Waverly Academy has nothing to say about framing Mel for plagiarism. In many games, you're left to assume that certain events were either accidents/coincidences, or something the culprit did without formally taking credit for it.
Are there any situations like that which you readers can think of? Any tiny, unexplained villainous actions from the Nancy Drew series (or Disney!)? Mention them in the comments, and we can go crazy analyzing them.