There are 2. First early on shortly after Rona runs out on her mom's Christian friends she remembers a scene where they're singing happy birthday while someone v*.
Then again about 2/3 through when you see a series of shots showing an apple rotting, shortly after there's a scene of her v* violently. Both are into a toilet and you don't see much but strong audio.
Not so much scenes. A man is shown briefly in a straightjacket as part of a flashback sequence. Later, Rona takes a phone call from her father who has been institutionalized. He is clearly unwell and unhappy about being there.