Recently I bought a film in iTunes and streamed it using the Videos app. Afterwards I found that my 'Other' memory usage had jumped massively (to the point I couldn't watch or download anything else).
I do know that when I download films and then manually erase them the memory is reclaimed.
Eventually I had to back up the iPad, erase and restore it. This is a very drastic fix every time I watch a film! Is there any other way to force the Videos app to remove the streamed film from memory?