Hi Andrew! Caller here, thanks for answering! Here's an example you were missing: one of my students once said "today is a nuts day" instead of crazy, so now me and my friends use that phrase. Just silly stuff like that. Definitely not the l-r shift. And in response to your guest, I have learned a second language in a foreign country and I have made these mistakes countless times, and I still think it's funny. I'll keep your response in mind next time though.
Thanks again!