After the funeral, the camera follows Charlie past a stock of saline bags dated to expire in Nov 2021 although the movie is set in the early 2000s. These bags expire typically within a year of manufacture.
A patient with cardiomyopathy is not at risk of coronary disease and heart attack like Amy's cardiologist is suggesting but of sudden death by arrhythmia (electrical problem rather that conduit problem).
Being responsible for a patient in an ICU does not mean that the nurse has to mobilize comatose patients by themselves.
There is no reason why "C-peps" (C-peptid) would be routinely checked in a patient who is not a diabetic and did not suffer from hypoglycemia.
The first scene alone is filled with inaccuracies: the nurse tells the junior doctor to swap for the compressions when he only has been doing them for 1 min. It is a bit soon. But then is heard doing the compressions for 4 minutes in a row, which this time is way too late.
The nurses joke that "Code Purple" is a spoof on Code Blue (a medical emergency in the hospital) and that Code Purple means pizza is available in the break room. "Codes" can vary between hospitals. Infant kidnapping can be "Code Purple", "Code Pink", or something else entirely.
The nurses all count out loud from 1 to 15 when they do chest compressions. CPR training includes counting compressions out loud. It's not unusual for a nurse to do it during a code.
Ana suffers an adverse reaction to amoxicillin, which could be anything from a rash to difficulty breathing. Asking about the patient's skin is not out of the ordinary.
In the first scene, the patient is in asystole, then back in a shockable rhythm within 1 min. That's unlikely, but not impossible.
Comatose patient's eyes don't stay shut easily. Part of the care is to regularly lubricate the eyes with gel and gently tape them shut.
Amy faints, losing consciousness for at least an hour (she has had time to have two blood tests to check the evolution of her troponin) and yet she wakes up in an ED bed (she should have been transferred to the ICU), with just some oxygen in nasal prongs and no medical attention (no mention of a chest X-ray, echocardiogram, ECG, etc.)
When Charlie is being pulled over, police car has LED emergency lights, which weren't available in 2003.
Any patient is the ICU with a confusion or neurological problem (like Vanessa's mother or the seizures guy) would get a blood sugar level testing which would tell there is a hypoglycemia.
The "bad nurse" sticks a needle to the side of the saline bags, which would naturally make them drip and empty over the course of several days or hours.
There is no reason why Amy would deduce that her female patient has had insulin injected to her without checking her blood sugar levels, which is never done.
The staff say that Ana suffers from an "adverse reaction to amoxicillin", but this term is very inaccurate to describe a Stevens-Johnson syndrome.
The "bad nurse" sticks a needle into the side of the saline bags, instead a using the white outlet that exists to add medicines.
A cardiologist talking to a nurse patient would call a heart attack a myocardial infarction, or MI.
In the first scene the doctor in charge asks if it is a shockable rhythm. He is looking at the monitor and giving orders, so he should have at least asked "Do you agree that this is a shockable rhythm?" if he wasn't sure.
In the first scene the junior doctor should have been alarmed when they arrived in the room because of the patient's foot jerking, not once he looked at the patient's head and monitor.