Carrie is in work clothes in her office, then in the next scene comes out of her office in her softball uniform. The blinds in the interior windows have been open the entire time.
The hard wired land line phone was dead when the lights went out, then had a connection after the lights came back on. That's not how it works. The phone would have worked unless it's line had been cut whether or not there was electricity.
An aerial overview of Central Park before the softball game shows trees in full autumn color; however, the game itself is played against a background of very (and only) green trees.
The letter proving two of the perpetrators' guilt was still sealed shut.
A psychiatrist wouldn't have revealed other patient's names.
After her friend's "suicide," Jessica tells his lawyer that--despite all the time she's mentioned them in her books--that she has no idea what an executor does. This is a major goof, as in 'Benedict Arnold Slipped Here," she served as the executor for the estate of elderly recluse Tilly Adams.