Corrected entry: In the scene where the Americans are making moonshine, they are simultaneously mashing potatoes and distilling the moonshine, but there's no sign of any fermentation going on, so it's not clear how the alcohol is created.
Captain Defenestrator
15th Aug 2010
Correction: It's mentioned earlier that they've been collecting the potatoes and doing something secret in that shed for days, so the batch that's distilling currently has had time to ferment and the potatoes that are still mashing are likely preparing for another batch later.
Captain Defenestrator