When sleep subject Paul Langois goes into cardiac arrest, no one does anything. Medical research firms are required by law to have resuscitation equipment, and police officers (like Captain Siska who is standing nearby) are trained in CPR.
Doctor keeps referring to ECG (heart) monitor as EEG (brain) monitor, while in conversation with Kolckak. Further he describes Supra-Ventricular Tachycardia, a coronary rhythm, as Delta waves, a brain function. To their credit, during the death of Paul Langois, they do an excellent job of showing the progression of a dying heart from Ventricular Tachycardia to Vetricular Fibrillation to Asystole. Unfortunately, it's not monitoring the subject's brain.
When Bobby Ray Solange is in the recording booth, he isn't wearing any headphones. He's also standing too close to the mic and the microphones are incorrectly placed in the booth for an instrumental-only track.
When the monster attacks Kolchak in the sewer, the zipper of Richard Kiel's monster costume is clearly visible on his back.
There shouldn't be any light at all in the sewers when Kolchak is down there beyond his flashlight.
Yet it so bright that you can see everything while he is.
After Paul Langlois, the Sleep Subject dies in the lab, his eyes twitch a few times.
Kolchak is supposed to be looking at a gum tree (which do not grow in the swamps) but the leaves in question look more like a magnolia's, which do grow in Louisiana but not in the swamps.
After the police officer on the motorcycle is killed, Kolchak is seen driving past a Pacific First National Bank. The show takes place in Chicago l, which is more towards the east coast of the United States. The bank would be in California, where the show was actually filmed.
The chef of the Chez Voltaire restaurant should not have been murdered. He didn't seem to have had anything to do with Paul Langois or Pere Malfait.