Errors in geography: The film avoids identifying its setting as either Britain or America. Conveniently, Mr. Fox's species
Vulpes vulpes is found in both countries. The human town has some very British details including a round red post box (American would be square and blue), the station wagon has a right-hand drive, and the humans have British accents. (Even if the setting is England, the animals' American accents are permissible as an element of fantasy.) The beaver's species is given as
Castor fiber, the Eurasian variety (the American variety is
Castor canadensis). However, the wolf's mountain looks more like a place in America or Canada, and more conclusively, there is an American opossum among the animals. There are no native opossums, nor any marsupial relatives, anywhere in Europe, so an opossum cannot be from the same region as
Castor fiber.
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