Every action that is performed will be recorded as a log with the form. In the log you can see if a deal or person has been created or updated. There is also a link to the related Pipedrive casu.
The log also shows if an activity or note has been created.
Did something go wrong with the submission or was the Pipedrive api down? You can easily rerun the feed to Pipedrive by clicking the process feed button.
So you can also edit the submission data in the form itself and then re-run the feed.