To my knowledge, we've never had mismatched engines on ours, here. Many years ago, I was introduced to some nasty -600s that ran intermixed engines, which had some of the mentioned anomalies. Except they weren't anomalies; the ops manuals and notices stated they were to be expected, and therefore 'normal'.
Another odd thing is when an autothrottle induces a greater stagger than manual thrust. Old kit, I guess.