Massive factual error....
Why has nobody picked up on the fact that conjoined twins are ALWAYS identical. They arise from ONE fertilized egg, which either fails to split fully, or splits but then becomes reattached. Thus, both twins would look the same... To have one twin looking like Matt Damon and the other like Greg Kinnear is a biological impossibility.
You'd think someone had bothered to check this fact in preproduction...