I guess everyone has that "Aha!" moment in this case. For me, his diction in that interview is pretty par for the course in his other interviews I've seen and doesn't really put up any red flags, but I always found this video odd as far as Hobbs goes. At the 7:15 mark, you can actually hear him swallow hard when he attributes the murders to satanism -- the classic telltale sign of lying; and the guy just looks like he's going to poop a brick he's so nervous.
West Memphis Three - Geraldo Special Report 1994 Part 5 - YouTube
Now I certainly don't identify with those people who are absolutely convinced Hobbs is 100% guilty, but just about everything about him in those Geraldo clips looks suspicious -- i.e. his body language, his weird lack of emotion, mannerisms, etc.