I know it can be irritating for regular RAF bods to see VR(T) uniformed staff making mistakes in the messes but they do these things because no one has shown them what the 'right' thing is.
A week at Cranditz is for most the only formal exposure they get to the parent service and there is a limit to what is taught in that time. The next exposure is on summer camp where the mistakes arise.
I would also suggest that because of their greater exposure to the wider world, VR(T) officers can sometimes highlight how daft some of the things the regular forces do are. A bit of slack would go a long way.