Just a brief addendum to my trip report. On one of the many, many trips through it's a small world, people behind me were attempting to spot one or more hidden mickeys in it's a small world. I didn't remember there being any on that ride, and said so -- they were politely skeptical of me saying there wasn't one. Since they seemed sensible, I checked on my phone and on the next trip through, took a good hard look at the vines hanging down around the elephant and monkey.
Sure enough: one of those vines doesn't have leaves: it has mickey heads. Who knew? Kinda cool.