How to verify that the recorded script is working fine when re-executed from JMeter? Where does is save the screenshot/ or proof of re-execution so that can be verified for it's correctness. Here we are talking about web load test.
Try with Save responses to a file listener. It will save all files to a folder, jmeter has requested as a part of load testing.
Sifting through the files after test execution, should give you an idea .