Continuity mistake: Walter near the beginning of the film, is going over the ship's systems. He checks the fetuses inside a compartment and sees a dead one. As he removes it, the slot it came from is full of blood. He places it inside a container. Then as he hits the button to close the compartment, the slot has no blood in the next shot, and no implying he cleaned or decontaminated the slot. (00:08:00)

Alien: Covenant (2017)
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Directed by: Ridley Scott
Starring: James Franco, Michael Fassbender, Noomi Rapace, Katherine Waterston
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Trivia: When David is cutting his hair, he is singing, "The Man Who Broke the Bank at Monte Carlo." This is a reference to the film, "Lawrence of Arabia." In Alien: Prometheus, David had a fondness for that particular movie and emulated Peter O'Toole, who played T.E. Lawrence. In the movie, Lawrence sang that song while riding on a camel in the desert.
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Answer: It doesn't matter anymore at that point. He has full control of the ship and can change anything he wants. Including the logs, if it's necessary.
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