I suspect that is correct. Or more specifically, ABC.
Obviously this all seems odd because Disney/ABC, Universal/NBC, which seems absurd since Disney uses ABC all the time. I don't even watch the show, but apparently there was an entire episode of "The Middle" at Disneyland recently that they promoted the absolute hell out of. Same with their Star Wars episode.
Thinking about it, though - I want to say that because of those very blurred lines between the Entertainment and News Divisions at networks, and those antiquated rules about which falls under which (Barbara Walters has talked about this on the View before), it is plausible that the Tonight Show, even though it's a talk show, straddles those lines which would invoke some sort of "equal airtime" thing.
Then as soon as I arrived at that possibility, I remembered the week The View spent with the round table smack in front of Sleeping Beauty's Castle, and the guests came from inside and sat down every day. That little Universal ball is nothing compared to that.
I'm wondering if it's not about the ball at all, because if you look at the pics in it - it does kind of stand out and it looks like it's growing out of his microphone. It may have just been too visually distracting. It may have nothing to do with whatever supposedly went down, just be a coincidence.