At the drugstore, Ike tells Dr. Klum that anyone who crosses him gets "rubbed out" by Spike. Spike gives the "okay" sign with his left hand, then places his hand in his pants pocket. Next shot is a wider angle, but now Spike has his arms crossed.
Although the film is supposedly taking place in New York City, Molly's car has California license plates and the exteriors are obviously California, mostly Los Angeles and vicinity.
In the shot from behind Molly's lunch counter of the patrons awaiting their orders, a shadow of the boom microphone is visible on the wall behind.