When the hit man is getting ready to fire the gun by the escalator, he looks up and sees the entire group of people on the escalator coming down. In the subsequent shot, due to the ceiling, all he can see are the legs of the people at the front of the group.
One sequence shows a jet aircraft landing. The approach shows a Boeing 707 or similar; a close up of the landing gear is a Boeing B-52; and the aircraft at the boarding ramp is a Boeing 747.
While talking to McCloud about a retired hit man Sgt. Thatcher refers to Clifford as Captain Peter J. Clifford. Clifford's rank in the series was Chief, not Captain.Characters throughout the series referred to Chief Clifford as both Chief and as Captain. Both are correct under the NYC police command structure.There is no Police Chief. Clifford was Chief of Detectives, with the rank of Captain. The NYC police department is headed by a Police Commissioner, and a Deputy Commissioner. Under them are various Chief of Precinct ranks. So, this is not a character Goof.
McCloud rushes into the warehouse with the artwork. He gets everyone to take cover and engages in some gun-play with the button man. At one point, McCloud is behind some wooden boxes and some plywood juts out from the boxes. McCloud's face and right hand (with his .45) are exposed to the camera. But his face is presumably behind the boxes to the hit-man, while his gun hand is exposed to the button man. A squib goes off in the upper right corner of the plywood, signifying that a bullet from the hit-man has just struck there. Had this really been a bullet striking that corner, it would have gone through the plywood and hit McCloud's wrist. Obviously, this does not happen and McCloud gets his man once again.
Right after Clifford tell McCloud that he is assigning him to guard Yerby while Yerby is in New York, the scene changes to a New York airport (LaGuardia or Kennedy?) where McCloud will meet Yerby. However, one of those airport scenes is clearly Dulles Airport, in northern Virginia, about 25 miles to the west of Washington, DC.
The button man holds up in a fleabag hotel in New York. As it turns out the reason he has chosen such a cheap hotel is because it is across the street from a tailor's shop where his intended victim will be visiting soon. But his victim is wealthy therefore the tailor's shop would obviously be a high-class establishment. So why would a run-down fleabag hotel be across the street from a high-class tailor shop? Such establishments would be in different sections of New York, not across the street from each other.
Towards the end, when McCloud has focused on the son as the one who hired the hit-man, Mrs. Yerby volunteers to call the police to arrest her son. McCloud tells her to call Sergeant Thatcher and gives her a phone number to call. McCloud then walks out the door, relying upon Mrs. Yerby to carry out her pledge to turn in her own son. No police officer would make such an error (particularly since Mrs. Yerby had only recently been eliminated as a suspect and could conceivably still be a perpetrator). Instead, McCloud would have been derelict in his duties if he had not called it in himself, or better yet, called it in on his squad car's radio.