When Steve and Mary take a cab to the aquarium with the baby, Mary is seated left of Steve, but after changing plans midway and returning home in the same cab, she steps out from his right side.
After Mary and Steve's wedding, as the camera is following them to their taxi, crew and equipment, including a stepladder, can be seen reflected in the limo's left rear window which is partially rolled down. And, as is the case in many films, the limo's polished finish has been dulled to matte to prevent reflections.
When Steve returns to the newspaper after being in jail, as he is walking through the newsroom, a shadow of the camera following him falls across a column in the foreground.