Pam is talking to Jim in the break room. Simultaneously, at around 8:53, she is seen sitting behind the reception area at her desk. Seconds later she is still talking to Jim in the break room.
Meredith climbs on a shelving unit, and it falls on her. She is seen under the fallen shelves, calling for help. About a minute later, Darrel finds the picture of Jan on his iPod. In the next shot, Meredith can clearly be seen standing at the left of the screen, near Roy's right shoulder. Then during the closing sequence, she is once again under the fallen shelves, calling for help.