These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Darker and Edgier: This is REALLY disturbing since it's being compared to The Day After!
Darkness-Induced Audience Apathy: If you are a cynical soul, you will likely experience this as you watch the film. Then again, the whole point of this film is to demonstrate that in the event of a nuclear war, there will be no happy ending in the aftermath.
"Funny Aneurysm" Moment: When Jimmy learns that Ruth is pregnant, she tries to calm him down, saying "It's not the end of the world". Three weeks later...
"There was the skeleton of...a cat! A cat's...skeleton!"
Narm: When the first bomb is dropped on the RAF base and there's a flash, we cut to Jimmy's father on the toilet who proceeds to utter "Bloody 'ell!" and tries desperately to pull his trousers up. Because it's important to remember your dignity.
Some Anvils Need to Be Dropped: No matter what those "Protect and Survive" booklets issued by the government told you, the UK government expected at least 20-25% of her own population to die in a 'minimal' nuclear exchange (of the kind needed merely to put her out of the war). The rest would not be very well off, for that matter. This needed to be said, and this film said it loudly and without any sugaring.
Squick: The radiation sickness scenes are major examples of this.