Other mistake: At the start of Rimmer's exam, the invigilator orders the students to "turn over their papers and start". Rimmer reads one side of the paper, then turns it over to read another question. The back of the paper should have been blank as otherwise there would be no point asking the students to keep the papers face down before reading the questions. (00:15:30)
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Suggested correction: He turns the paper over, but it's not possible to state why. It's more likely it was to check if he'd missed anything. Also, the 'back' of the paper can be seen to have writing on it, which you'd expect an exam paper to have (name of the exam, instructions, etc.).
