Some debug code that should have been removed, probably.

In the function drupal_log_to_file
line 263 contains the code: echo 'matched<br />'; and
line 265 contains the code: echo 'filename: ' . $filename . '<br />';

When using the module these debug-messages causes some minor irritation and can not be turned off by the user interface. These lines are also on a different indent than the rest of the code, so my guess would be that this is some debug-code that the developer forgot to remove. But being a novice drupal-user I could be wrong about this.