Troubleshooting and finding Related Records that triggered Paused Process/Flow Interviews

-Open up the paused Flow Interview (Setup -> Process Automation -> Paused Flow Interviews), click on the desired record and note the created by username and created date. 
-Click on the created by user to get its ID (Find the Salesforce ID for a User or profile ) and take note of the created date.
-Go to the Time-based Workflow monitor page (Setup -> Events -> Monitoring -> Time-based Workflow) and filter by user id. The records with the matching created date and flow/process name is the one likely associated with the paused interview.