At around 43 mins when Catherine goes to eat with her mother and Sam, the left strap of her dress falls down but in the next shot, it's back on her shoulder.
However in that shot Catherine's hand is moving down from near her face and she easily could have adjusted the strap in the time she was not in shot.
However in that shot Catherine's hand is moving down from near her face and she easily could have adjusted the strap in the time she was not in shot.
When the murder victim is being turned over while being examined at the crime scene, both eyelids visibly flutter.