When Senator Palmer is talking to his son, the clock reveals the time 4.57, however just seconds before had the "24" clock shown 4.37.
When Gaines shoots Dan, he aims at a slight angle so the fatal wound would be in his chest, but when he lies dead in the next episode, it's in his head.
When Jackie crashes in the operating room one of the nurses declares that she is in asystole, which is followed by the sound of a defibrillator being charged and discharged, a very common TV/movie mistake. Asystole is the total absence of ventricular contractions of the heart muscle, also called "flatlining", and cannot be reversed with a defibrillator. Defibrillators are only useful when the heart is still beating with what is known as a "shockable rythm" like ventricular fibrillation (V-Fib), they don't work on a completely stopped heart. The only way to reverse asystole is with the use of CPR and drugs like epinephrine, if the heart is able to be restarted it will be beating in an unsteady rhythm, V-Fib, which can then be shocked into a normal rhythm. However reversing asystole is very unlikely, even with the resources of an intensive care unit only 15% of patients that present with asystole survive.
A camera moves into the shot on the right when David is talking to his daughter.
When Jack is walking down the corridor, a tripod and piece of wire is clearly visible on the right.
Maureen Kingsley reveals that her main source on the story she is threatening to run about Keith Palmer is his former therapist, which means Keith's therapist is violating doctor/patient privilege. However no respectable journalist would use such information, as it is both unethical and illegal for a doctor to violate a patient's confidentiality. Even a cheesy tabloid journalist would think twice about using such a source.