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.
YMMV: A Dolls House
Alternative Character Interpretation: An only moderately altered interpretation of Nora has the side effect of altering the entire play. In the conventional reading, Nora is a naive innocent who gets a harsh lesson in the world and grows up to move out. A wholly different interpretation is that we're actually seeing a plot involving several conspirators, organized by Nora, to break her tyrannical husband's hold. The Doctor being "ill" is a setup—he's fine and the card with the X through it is a signal he's ready for Nora to take off with him as they've obviously had a thing going on. Nils Krogstad's reasons for going along with the setup are obvious (knowing he's on the chopping block at work because of Torvald, he has nothing to lose and everything to gain revenge-wise) and Nora is also, more kindly, masterminding the reunion of Krogstad with his old girlfriend and her old friend, Christine, who's been the victim of a similar domestic tyranny. Nora is in fact a Diabolical Mastermind/Magnificent Bitch orchestrating her husband's downfall.
Misaimed Fandom: No, this is not a play about how evil men are and how terrible marriage is. It was intended to show that every human person has pros and contras, no matter what their gender/social standing/etc. is. (i.e., Torvald and Nora's relationship goes down the toilet because their views of each other's were terribly distorted and Nora realized how harmful this was for her so she decided to live her life and not play along anymore... but Krogstad and Kristine managed to strike a deal and went the opposite way, deciding to see if a prospect relationship will work well this time.)
Some Anvils Need to Be Dropped: After the truth comes out about how Torvald doesn't really love Nora for Nora, she removes her proverbial mask and tells Torvald why she must leave him. After spending the entire play masquerading as an airheaded ditz whenever her husband's around, she suddenly shows him how serious and well spoken she truly is. If the effect is jarring, the message is downright radical considering the time when the play came out.
Why Would Anyone Take Him Back?: Averted. Torvald berates Nora viciously, then just as abruptly decides to forgive her because she is like a child and knows no better. She allows him to hug her and tell her how much he loves her, leaves to get changed - and walks back in with a suitcase to announce that she's leaving him.