I'd like to see sub-tasks created on a stories within a sprint, so we can see what wasn't really thought of as part of sprint planning. I could take this information in to a retrospective to discuss.
GreenHopper doesn't really differentiate sub-tasks added before and after sprint started. In Plan mode, sub-tasks can not be added to a sprint independently of their parent. Adding sub-tasks to issues already in a sprint is not considered a scope change. However you can try and use JQL to query all subtasks that are in an active sprint and that are created after the sprint start date. Something like:
project = "My project" and sprint = "Sprint 9" and issuetype = SubTask and Created >= "2013/06/01"
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