I was offered a job in Japan, and will go over on a WHV.

Now I am worried that I won't be able to get the visa, because they seem 
to have a lot of ridiculous requirements about how you have been saving 
up for the trip.

I have enough money, but some is in cash... and they don't want "lump 
sum deposits" into the bank account. Also, I have not been working 
recently (I have been studying).

Does anyone know how closely they follow all these rules about the money 
in your bank account?? Are people rejected from the WHV because of these 
technicalities?