Factual error: Cher complains that Astroturf is going to ruin baseball. Mermaids is set in 1963 when Astroturf was still being developed under the name Chemigrass. It wasn't christened Astroturf until it made its world debut on the floor of the Houston Astrodome in 1966.
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Mistakes
In the scene where Cher is giving out tubes of toothpaste to the kids for Halloween, the bowl is almost emptied by the costumed kids and in the next scene the bowl is full again. See more...
Mermaids mistakes
Continuity: 35 minutes into the film, Cher enters her bedroom with a bowl in her right hand and a bottle in the left. When she gets into bed, both have switched hands.
Continuity: In the scene where Cher is giving out tubes of toothpaste to the kids for Halloween, the bowl is almost emptied by the costumed kids and in the next scene the bowl is full again.