There’s the gig economy, and then there’s a homeless day laborer being asked to play Adolf Hitler in a Holocaust drama. Such is the plight of Shakib (Mohsen Tanabandeh) in Houman Seyedi’s “World War III,” Iran’s submission for the international feature Oscar. It wasn’t shortlisted, but probably would have been were the award given to the film with the greatest ability to keep you guessing as to what form its narrative will eventually take. For that premise, as odd and even zany as it may sound, gives approximately zero indication of how genuinely strange, unexpected and upsetting so much of...