When Loretta and Turk join Marie on her table, there are customers dining in the background. On the following cut, the customers change.
When the telephone men are fighting the mobsters, there is a shot of one of the mobsters fighting with gloves on. Prior to the fight ensuing, though, no one from either group was wearing gloves.
The taxi cabs have identification numbers printed on the side which matches the last three numbers of the license plate. This is evident by the taxi that takes Terry to Nicky's address. However, the taxi that takes Terry to the Alexander Hotel is missing the identification number as well as a license plate.
When Terry and John go to tap the lawyer's office, they walk in with only one portable modular phone between them. But on a following cut, while Johnny is using it to listen in on the lawyer, Terry at the same time is now using another modular telephone to make a call. They come in with one modular phone and in the next scene there are two of them.
When the mobsters lock Terry in a back room and pull out the telephone from the wall, Terry then connects a portable modular telephone so that Johnny can listen in. But this doesn't make any sense since Terry did not have a portable modular telephone with him when he came to the mobster's place. Terry also acts as if he took it out from his back pants pocket, but due to the size of the unit, there's no way it could fit in his pants pocket.
When Flood and the workers arrive to rescue Terry, the same audio of Flood yelling out "Come on boys" is repeated two times, back-to-back. On the first one, his mouth is not moving. Apparently, it is leftover audio from a previous edit.
At the beginning of the film, when the shot is tracking left through the telephone company's "troubleshooting department", a moving shadow of the camera falls across a pillar in the foreground.
When Terry is in front of the room occupied with Nicky and his mobster friends, he starts listening to their conversation through the door. He then starts to open the door, but a mobster armed with a gun surprises him from behind and forces him into the room. The film does not explain the purpose of Terry wanting to enter the mobster's room in the first place, especially without a gun.
When telephone repairmen Terry and John get called to the site of a fire, Terry proceeds to enter a burning building to cut wires. Even in the '30s, civilians or non-firefighting personnel would not be allowed inside a fire perimeter never mind entering a burning building and interfering with firefighting procedures.