Incorrectly regarded as goofs: (At 57:15) The teacher is formally called Rainer Wenger, although informally he uses his first name is Rainer, among his students initially and later his surname during the project, Wenger. One might think the principal would use his first name when talking to him, but in Germany when adult colleagues speak to each other, they use their last name when talking to each other, i.e. Herr Wenger.
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