Yes, you could check for example the currentIterations flow variable and write the current in-loop table to a file with a Table Writer node. You can use the same flow variable to form a unique filename each time you write one to a file.
Once the loop has completed you can read back the written files with Table Reader to explore their content. For sure all this will make your loop slower but at least you can have some insights into how things are going.
I can think of other options, like using a Java Snippet or R Snippet node to serialize the interim results, or writing them to database.