Cecilia and Raymond are on the end of the dock and Raymond turns around and runs. Cecilia then says her line, turns around and runs. In the next shot the two girls are running towards the end of the dock. You can see Raymond running towards them but Cecilia is gone. She should be in the scene running the same way.
Throughout the movie, Aquamarine is always eating salt and putting salt in strange things like ice cream. To film these scenes, they had the actress, Sara Paxton, eat sugar instead.