Plot hole: Patrick Redfern needs someone to be in the boat with him to corroborate his and his wife's deception and be his alibi. That is whole point of his wife lying on beach - he gets this when taking Myra for a ride - but it was portrayed as a random ride she got, he did not intend or plan giving her a ride, he did not see her loitering near the boat, or even in view of him untying the boat. Even if that was intention in the story for him to be seen ready to cast off, the movie viewers did not see her viewing him, only her appearing just before he was set to cast off. Without someone with him the whole deception would not work, he would have no alibi, he could have killed Arlena unseen.
Trivia: Poirot finds out from insurance documents that the surviving husband of the murdered Yorkshire woman in the beginning of the movie, Alice Ruber, was called "Felix Ruber." Poirot had been told by hotel guest Patrick Redfern, a Latin teacher, that "Giuseppe Verdi" means "Joe Green" when translated into English. Poirot explains during the murder's solution that this triggered him to translate the two Latin adjectives "felix" (strictly: 'filix', not 'felix') and "ruber" into "fern" and "red", respectively, and thus "red fern." It is part of the evidence that Felix Ruber and Patrick Redfern are one and the same person, meaning that Patrick was involved not only in the island murder but also in the Yorkshire murder.
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