"The Viscount Who Loved Me" has one of the most famous and wonderfully bonkers scenes in the entire Bridgerton series. During a conversation with Anthony, Kate is stung by a bee. Anthony panics, flashing back to when he watched his father die from a seemingly insignificant bee sting, and he tries to literally suck the venom out of Kate. The problem is, she was stung on her upper chest, and his mother and Lady Featherington spot them in what appears to be a compromising position. It's this incident that forces Anthony to marry Kate midway through the book, much like his sister Daphne had to with Simon previously.
Perhaps to avoid those comparisons to the previous season's "and now we must get married" storyline, the Netflix version changes up this scene. Kate does get stung, and Anthony does panic, but there's no "sucking the venom." Instead, Anthony panics and Kate reassures him, putting his hand on her heart so he can feel that's she's fine. They nearly kiss, before freaking out and leaving, without anyone seeing them.