look for magento issues with SUPEE-7405

issues.php

<?php

# use like this:
# cd <yourmagentodir>; php -f isssues.php

$files = `find . -type f -iname "config.xml"`;
$files = explode("\n", trim($files));


foreach ($files as $file) {
    findissues($file);
}

function findissues($file) {
    $xml = simplexml_load_file($file);

    $events = $xml->xpath('//events');

    foreach ($events as $event) {
        $observers = $event->xpath('./*');
        $lowerCaseNames = array();
        $upperCaseNames = array();
        foreach ($observers as $observer) {
            $name = $observer->getName();
            $lname = strtolower($name);


            if ($name !== $lname) {
                if (isset($upperCaseNames[$name])) {
                    echo "issue1 on $file $name\n";
                }
                $upperCaseNames[$name] = true;
            } else {
                $lowerCaseNames[$lname] = true;
            }
        }

        foreach ($observers as $observer) {
            $name = $observer->getName();
            $lname = strtolower($name);

            if ($name !== $lname) {
                if (isset($lowerCaseNames[$lname])) {
                    echo "issue2 on $file $name\n";
                }
            }
        }
    }
}