In Harry Potter and the Chamber of Secrets it is revealed that
Ginny is being possessed by Tom Riddle and is the one opening the Chamber of Secrets.
The book seems relatively without holes in this regard. However in the movie when Harry discovers Justin Flinch-Fletchley we see moments prior to this
Ginny is studying in a room full of people.
This implies that the person opening the chamber of secrets couldn't have been in the chamber when the second attack occurs. Is this just a goof in the movie or is there an alternate explanation for this? Is the Basilisk acting on its own in the movie?