Adrian shows no reaction to Melanie's screaming in the kitchen.
In the 65th minute, Edgar is given a cup of tea. One can clearly see by the angle that the cup, if it contains anything, would be less than half full when handed off.
In the 63rd minute Edgar says "You're all mentally deranged!" The definition of deranged as 'mad, insane,' therefore 'mentally' is deemed redundant.