At the end of the opening song, Andrew's academic robe gets tangled around the sprockets of the back wheel, causing him to fall. When he gets up, the robe is magically untangled.
The traffic on the road, including the double decker bus, is driving on the right hand side, American style.
Wires can be viewed twice: when Andrew's ringmaster costume inflates and he rises to the tent top and when Selena's brothers chase Andrew up to the trapeze.