Other mistake: While Dr. Harvey is looking at his multiple reflections in the mirror over the sink, he sees the Crypt Keeper reflection. It then cuts to a close-up facing the real Dr. Harvey as he freaks out, and it's a flipped shot—note his shirt and sweater are backwards (this is not a mirror's reflection)—right before he gets his foot jammed in the bucket. (00:31:05)
Other mistake: As the priest walks out of the haunted mansion with his head twisted, you can see the head and body don't step in time together.
Other mistake: When Kat chooses her bedroom in the mansion the bed should be covered in dust but it's not.
Answer: When Carrigan tosses the Whipstaff documents into the fireplace, one paper's hidden message appears on the back from the heat (if using lemon juice instead of ink, messages stay hidden and only appear when heated); it has a drawn map and handwritten "Buccaneers and buried gold, Whipstaff doth a treasure hold." Later, Casper tells Kat that he and his dad had great fun together playing pirates down in the lab, and Casper quotes the words from their hidden "pirate" message. So the handwritten note with map was actually part of their father/son beloved pirate-playing shared fun (note when the living Casper appears at Kat's party, he wears a piratey costume with a sword at his side). The pirate "treasure chest" contents were merely Casper's personal treasure: his glove and cherished autographed baseball, and it was kept in the lab's vault; even after Casper succumbed to pneumonia, Mr. McFadden kept it in the vault.
Super Grover ★