When searching around the lifeguard tower, Natalia finds a piece of a necklace worn by Cheryl Ladd's character on one side of the ramp. But in the flashback showing how her character lost the piece of her necklace, she was on the other side of the ramp several feet away from where the piece was found.
During the investigation a golf club shaft is found under a lawnmower. The shaft is determined to have been used as a lightning rod. After the lightning bolt hits the lightning rod, part of it is shown to be knocked off. But at most it would have flown a couple of hundred feet and landed on the beach. Not the thousands of feet it would have had to fly to land in the residential yard.
Lightning strike on a clear day? Seems a bit unusual.