I'm not sure if this can even be categorized as a slipup, but keep an eye on Toto during "If I Only Had a Heart." When Tin Man is dancing on the yellow brick road, he "toots" his hat a couple times, Toto is watching this, and Toto jumps back about a foot when it happens. Poor dog. As I said, can't really call this a slipup, but just something interesting that I noticed.