Revealing mistake: When Reese is leaving the dog cemetery, she brushes against one of the tombstones that has a stone dog on the top of it, yet as she walks past the dog begins to rock back and forth - clearly this is not a stone headstone. Pet cemeteries, just like human, have sturdy stone headstones to withstand the elements, not plastic.
Factual error: At Tiffany's, just before Andrew proposes, Melanie says Christmas is "four months away," making it August. She immediately heads down to Alabama to finalize the divorce and tell her parents she's engaged, but she and the townspeople are wearing warm clothes, including a long-sleeved black turtleneck and tall boots for her, and mid-weight jackets for the guys. They'd die of heat stroke wearing those articles in August in Alabama.
Audio problem: When Andrew's mother grabs Melanie's hand and realizes that Melanie has a ring, she say something to Andrew and at the same time Melanie says, "If it's all the same to you I would like to keep it..." Then his mom says, "You're Engaged?" Melanie is in the corner mouthing "quiet" but you don't hear it till the next shot.
Factual error: If Melanie is still married to her first husband when she is about to wed her New York man, than she would not have been able to obtain a marriage license, as it would have shown up that she is already married when they applied for a license. Therefore, Mr. Buford would not have been running into the wedding to inform her she was still married to Jake. She should have already known.
Continuity mistake: When Jake and Melanie kiss on the beach at the end of the movie, she leans in to kiss him with her head tilted to the right. It then cuts to a different angle and she is tilting her head to the left. In the third and final shot, her head is tilted to the right again as they kiss.
Visible crew/equipment: When Melanie pulls up to the Festival (right after the scene with the "reporter" from the Post at the Carmichael Plantation) you can see a cameraman on the right rear side of the car before he kneels down out of view and the audio microphone/boom in the shot being lifted away from the left side, up, and out.
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Factual error: While it may be an artistic thing for the movie, fulgerite (lighting + sand) does not create anything near as ornate, long, crystal clear or tentacle like as portrayed in the movie. If anything it leaves tubular or clump like structures that are more reminiscent of kitty litter.
Factual error: Melanie is walking up the aisle at her wedding in Alabama and her lawyer comes to tell her that she hasn't signed the divorce papers. The impression is given that she will sign them and then she can get married straight away. Alabama law states that you must wait 60 days following divorce before you can remarry. Melanie wouldn't have been able to get married even if she had signed the papers.