The glass that surrounds the Crystal Ball that Zuri's in disappears when it gets to the ground.
It's never explained how Emma was able to get hold of Austin's Shoe unnoticed.
In the Austin & Ally (2011) episode "Deejays and Demos", Dez has said that he's long stopped keeping living animals in his pants, but in this episode, it shows that he's had a Gerbil from New York in his pants when they got back to Miami, which explains why Kipling had been at him.