Mel listed as co director of this film
It is shown on the back of this bluray UK box at the top. Hover over the back of the box picture, and it will zoom in so you can read it. It clearly states "Directed by George Miller with Mel Gibson"
I had NO idea about this. Have any of you heard about this?
http://www.amazon.co.uk/The-Trilogy-Blu-ray-Region-Free/dp/B00CP1ZSA4/ref=pd_cp_74_0
"Men like you don't die on toilets." Mel Gibson-Riggs, Lethal Weapon