There is also government propaganda, yes [1,2] - movies that want to use army assets need script approval from the military - but I don't know, and don't think, this was the reason for most of the distortions I listed (nor would I say any except the Highway of Death one were nationalistic). In my opinion, the simple shared ideals of most in the entertainment business, without collusion or coercion (if we discount the leverage of finance from coercion), make for the far more effective propaganda. And occasionally, the propaganda is clumsy enough to get caught - such as when Roald Dahl's books were altered [3]. The list of changes [4] makes for interesting reading.