Well, what's to be expected in this show ?

These guys are not really investigating anything …  they "know" that Casper is hanging around, know his name and history in some cases and have these rituals that someone has told them will make the spirits come out and play. 

Not very much different then using a Tesla coil to stir them up or a KII to have a conversation, these guys seem to be much more upfront about it.

That said-
I'm not sure why they find a bag of what seems to be adult sized polio braces and say there are definately kids here.

Also curious that what appears to be the only unbroken fluorescent tube in the place just happens to wind up in the background and falls over.  ( and a third upright spike shadow appears between the other two at the same instant )

When Jason was tied up, did you catch the … ahem … EVP   right after he says "sounds like kids laughing"  ?    It sounded a lot like the one on SNL

http://www.hulu.com/watch/4261/saturday-night-live-haunted-house