Waititi's affably silly fictional nazi fable is seriously fun and has bags of charm, but drags towards the end a little and strains credulity often. The king of tonal whiplash is in riotous form here and hops from dark place to silly japes like some sort of mad rabbit. Tonally it sits somewhere between Son of Rambow and Wes Anderson but with nazis. The young cast are particularly strong here but I can't help wishing, however illogically, that the central duo had been Jojo & Yorki instead. I sympathise with reviews that say the shallowness of the endeavour belies the core message, but fundamentally Waititi's swaggering charm can render even the most misguided effort oddly affable.