1) Pushing back from the gate knowing the severity of the weather insteading of delaying departure for improvement of known severity of WX.
It was my impression that the report said the met was just another night in the ITCZ. And haven't we put to bed this canard that they "flew into a thunderstorm"? Certainly there's nothing on the CVR (or the FDR) to indicate that, other than a cabin announcement about some routine turbulence with a bit more to be expected ahead.