So that moon door scene was pretty faithful to the books but they left out a detail or more specifically, a character: Marillion, he's some weirdo bard singer that Lysa picked up and kept around the castle cause he was thought he was cute or whatever. But he was there while Lysa was confronting to drown out her screams with his singing. He was also mad at Sansa cause he made a couple passes at her but got rejected hard. Luckily Baelish shows up and does the deed; and as the guards rush in, he immediately puts the blame on singer dude.
Interestingly enough, he was in the show however he was killed off before we could get to where we are now. They're making changes and it's super weird but wildly entertaining. They're pulling a walking dead on us.