Yes I have tons of reasonable doubt and would vote NG. No vehicle ever left the house that night, nearly everything in his 'confession' was shown to be untrue (or 'speculation', as he phrased it), and it became clear why they put Alex and his video interviews on - only so they could get in Joe's interrogation.
Someone let the boy out of the house that night, but I don't believe they proved it was Joe. And yeah, I do think his 'confession' was coerced. Did they ever say how long in total that lasted? I heard the video was about 4 hours before they cut it down to the 2 3/4 shown, but how long did they interrogate him altogether? It surely looks like a lot longer than 4 hours.