Revealing mistake: Casper is shown tying together the shoelaces of the students in Kat's class. When the bell rings and class ends they all get up and fall down. If you look closely you can see that their shoelaces are not tied together.
Revealing mistake: When Kat goes through the Up and At 'Em Machine, the top comb makes contact with her head, and a few of the comb teeth slightly bend. Thereby revealing that the teeth on the comb are made of rubber.
Continuity mistake: In the will reading scene after the lawyer has finished, Dibbs' hands are folded on the table, then off it in the next shot.
Continuity mistake: When going through the Up and At 'Em Machine, Kat is splattered with toothpaste. It remains on her face until the blow-dryer segment, and it's suddenly gone.
Continuity mistake: While Dr Harvey is fighting the trio his pants are cut off, seconds later he comes out of the closet and his pants are fine.
Continuity mistake: After Kat goes through the Up and at 'Em machine while sitting in a chair, we see Carrigan and Dibbs go through it, and they're in another chair. They then leave the chair and walk through the tunnel into the lab. Later, when Casper pushes Kat backwards through the machine, the chair that Carrigan and Dibbs were on is nowhere to be found.
Answer: It was not Casper (now a ghost of 12 yr old boy) who wrote there was a hidden treasure at Whipstaff Manor. It was Casper's father, Mr. Mcfadden. The treasure in the box is an autographed baseball which used to belong to Casper, before he got sick and died. Mr. McFadden missed his young son Casper, so he invented a machine that can bring a ghost back to life. He considered Casper's baseball a treasure, because to him it is the greatest treasure there is - the baseball that belonged to his 12 yr old son before he died.
Super Grover ★