Could have been resolved if the dude had facebook
SPOILERS
Good film, but how simple could it all have been if Greg had Facebook?
CASPER: You ARE *beep* Julius
GREG: Dude do you have an iphone? Go on facebook, there, see I'm not you goon, there's my name and there's me enjoying a holiday last year, there's me eating a burger, there's me and my group of holy water salesmen, Greg Newman now open the door...
Ok just carried on watching it as realised the cabbie wouldn't of allowed that but still...