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.
The fact that the actor received second billing on the movie poster may have also been something of a giveaway.
Nightmare Fuel: A quick shot of Irina's husband sitting in a bath full of blood with his guts ripped out.
One-Scene Wonder: Patrick Stewart as Karla in the miniseries. He doesn't even speak a single word during his one scene, but is still captivating.
Tear Jerker: Irina's fate. After Prideaux is tortured and confesses how far Control's investigation into the mole has gone, Karla drags in a beaten and tortured Irina and asks him if he knows her. Prideaux of course doesn't. Irina then smiles sweetly as if to say 'I forgive you'. Then Karla has her shot right in front of him.