Daphne's relief that Fred escaped the ghosts; she quickly plays it off but it's enough to show how she cared.
When Shaggy and Scooby are caught for being in the school, Shaggy claims he and Scooby were alone. The others stand up for Shaggy and admit they helped to.
Velma, Daphne and Fred talking about how they were wrong about how they saw each other. It goes to show how they're learning to respect each other. Without the mystery, they could have kept their ideas.
After Scooby gets captured, they all decide that they have to save him.
After clearing their names they all go their own way, however they quickly think of another mystery to solve just so they can stay as a team.