One of the most interesting stories came from star Madison Iseman, who plays the production's plucky and bright-eyed babysitter, Mary Ellen. It's worth noting that this particular incident happened in the upstairs portion of the set, meaning it would've been hard for a cast or crew member to sneak past Iseman and pull a prank.
"The other day, we were filming this scene, and they were doing a test with Annabelle in a rocking chair all day. So she had pretty much been in the rocking chair all day. We weren't using her. And then we were doing this scene downstairs. After the scene downstairs, I run upstairs, and then the scene kind of ends. And I was just upstairs just looking around, just because they called, 'Cut,' and I was like, 'Okay, just going to peek.'
And I looked in one of the rooms, and Annabelle was just sitting on the bed. She was sitting on the bed straight up, her legs out, and I was like, 'Oh. This is weird. No one else up here.' They were like, 'OK. Setting up again. Come down.' So I ran down for another take. Take took two minutes maybe.
Ran back upstairs. They called, 'Cut.' Look in there again. She's back in the rocking chair. And after that, I was like, 'OK, who's messing with me?'"
On that same day, Iseman had an issue with her dressing room. "After that, when we wrapped, I went back to my dressing room, and my lights would not turn on. I'm not kidding. They would not turn on. I was flipping the switch on and off. On and off. Finally was going to leave, and then as I was leaving my lights turned on."