When Kojak is driving to the hostage situation, his car is a brown Buick Century with chrome rear view mirrors. However, interior shots of the show a Ford label on the sun visor as well as a lighter color rear view mirror.
At about 39:40, the old hostage played by William Hansen is comforting the wounded police officer when the alarm clock goes off. The scene then cuts to a take of the rest of the hostages, and, strangely enough, the old man is sitting among them. The camera immediately goes back to the dying cop, and he's still being comforted by the old man.
There were at least four different makes of squad cars from the NYPD involved in the chase from the armored-car robbery: Plymouths, Dodges, Chryslers and Fords. In the early 1970s, when this episode was filmed, the NYPD used only Plymouths.
When the police dispatcher calls out that an armored car robbery is in progress, we see a squad car driving down a street very fast (apparently en route to the crime scene). As the dispatcher continues talking we see the inside of what is supposed to be the squad car shown a second ago. The camera is focused on the 2-way radio. In the lower left corner of the screen we see the accelerator pedal on the floor of the car but no human foot or leg near it.
Although Siege of Terror is set in and was filmed in lower Manhattan, the police radio announces a robbery in progress at 4014 Nostrand Ave., an address in Sheepshead Bay, Brooklyn.
The police jacket for the dossier on Harvey Keitel's character, Jerry Talba, lists him as 5' 9". The actor is only 5' 7.5".
When Kojack is bring the officer out of the store, the doctor comes up and Kojack said, Don't bother, he's dead. As they put him on the stretcher, his arms are moving.