[1] Use the Packet Selection form to view any packet of your choosing in the block diagram. [3] Here you will see your packet's identification and relevant data that should stay consistent during its flow through the chip.
[2] You browse the list of packets that were sent during a test. The packets are sorted according to the time that they were sent. You can choose between viewing a full list of packets or only the unfinished ones for debugging. [4] Clicking on any path will bring up a draggable popup block that will contain additional information that pertains to the block the packet is heading to.
  [5] Packet Tracer will show you the time for which a packet gets to a certain block for any traveled (green) path.