When Annabelle goes to Simone's room after the day at the beach, in the first shot of Simone staring at the ceiling the bedside clock is clearly reading 11:29. The scene cuts back to Annabelle starting to knock on the door then hesitating and leaving. The next shot, again of Simone, shows the clock reading 11:24, a jump backward in time.
When they are viewing a film, Simone was wearing back the cross necklace. It was supposed to have been taken off when they went to the beach.
After Annabelle asks Simone if she would take her cross off, Annabelle turns to pick up her rosary. The microphone is visible on the inside of Annabelle's shirt collar.
In the classroom when Simone takes the note from Cat, you can see the microphone on the inside of Cat's shirt.