Carla's skirt is different when she ask the bus driver which bus to take and when she gets off the bus. However, this is due to a wardrobe malfunction. The skirt Carla originally wore came undone when she ran to the bus and was unable to be fixed quickly.
When Carla and Elizabeth are having the sex talk in the park, there is an animal balloon artist behind Elizabeth. The customers change position several times (sometimes, the people altogether) in a span of a few minutes.