When Danny goes to see Peggy in her dressing room in New York City, half the bulbs around her dressing table are lit. After he leaves, all but one bulb are lit.
When Danny and Mutt run into Googi at the construction site, the Chrysler Building can be seen in the background in shots from both sides of the truck.
Obvious painted backdrops of motionless spectators are used to simulate the back rows and upper tier of the boxing arena.