Errors made by characters (possibly deliberate errors by the filmmakers): During the role playing game, when John Henry encounters the Mind Flayer, he rolls the twenty sided die and claims to have rolled a "20". However, the 1 is clearly visible as one of the side faces showing to the camera. The "20" is on the opposite side to the "1" (all opposite faces of a twenty sided die add up to 21). So he has definitely not rolled a "20". In fact, from the angle of the two faces shown (the "1" and "19"), John Henry has rolled a "7".
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