Plot hole: Shortly after the ship flips over, the steward, Acres, is asked why lights are on. He explains they are emergency lights that will last three hours. The lights are left on throughout the movie, but when they get out it is bright daylight. Considering the ship flipped at midnight, there is nowhere on any ocean where it gets light at 3:00 in the morning.

The Poseidon Adventure (1972)
1 plot hole - chronological order
Directed by: Ronald Neame
Starring: Gene Hackman, Leslie Nielsen, Ernest Borgnine, Shelley Winters, Red Buttons, Stella Stevens, Carol Lynley
Continuity mistake: Gene Hackman and John Shea are both doused with water when they come out of the restroom. In the next shot, their hair is completely dry.
Mike Rogo: You weren't on the streets that long! How many guys did you know! Do you realise how slim even one of those characters is on this boat.
Linda Rogo: You don't have to shout.
Mike Rogo: I said do you realise...
Linda Rogo: I heard what you said.
Trivia: The scene where Belle (Shelly Winters) dives into the water was actually rehearsed by having her jump into the water. She decided to dive in while filming the scene and that take was used.
Question: Why did Jack Albertson hate working with Shelley Winters when making this movie?
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Answer: There's nothing specific reported about them, but other actors have also expressed disliking working with Shelley Winters. Stella Stevens, who was also in Poseidon, mentioned not getting along with Winters on another movie they made together because she was drinking at the time. Winters had a rather ditzy and brash personality that annoyed some people, which is probably what Albertson was referring to.
raywest ★
Moreover, Albertson once said, "The happiest moment making the movie for me was when she died."