Plot hole: How did Iris know that the coin would cause the accident?
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Suggested correction: Because she saw the coin in her pre-vision.
At no point does the film show that she knew the coin was the cause.
In every Final Destination film, the main protagonist will not only have a premonition of who's going to die but also what will cause it. Since Iris had a premonition of who was going to die, she also knew the coin would be the cause of everybody's death.