The wires were not crossed. I believe the sidestick transducer was put in the wrong way around reversing the roll inputs, even though it was designed to fit only the correct way. The flight control check may have also have been done without looking at the flight control page (as is the norm now) and only the sidestick position Cross, on the PFD, which gave the correct indications.
This has no bearing on AF447!
Lufthansa I think and the FO's sidestick worked correctly as he took control.