Ah, the Goosebumps screen adaptations are such a nostalgia trip. The 90s TV series basically took the books and did their own thing with them, but a decent number of those episodes are pretty direct lifts. I'd say the most famous one everyone remembers is 'Night of the Living Dummy', which was Slappy's big debut. That episode is iconic. 'The Haunted Mask' was a two-parter and really captured the book's creepy vibe perfectly. Then you've got ones like 'Say Cheese and Die!', 'Welcome to Dead House', and 'A Night in Terror Tower' that got full episode treatments. The movies are a different beast. The 2015 movie and its sequel mash up a bunch of monsters and stories into one plot—Slappy's the main villain, but you see the Werewolf of Fever Swamp, the Invisible Boy, the Abominable Snowman of Pasadena, all that. The new Disney+ series from 2023 goes back to adapting single books per episode, like 'Say Cheese and Die!' and 'Go Eat Worms!' again. It's a real mix-and-match history depending on which era you're looking at.
What I find interesting is how some stories, like 'The Cuckoo Clock of Doom', never got the live-action treatment, at least not that I can recall. They seemed to favor the ones with really visual, physical monsters. The TV show had over a hundred episodes, so there's a deep cut list of adaptations beyond just the famous ones.