Visible crew/equipment: When Mia first does the ritual, you can see the boom mic on the bottom right corner. It hides in the dark corner, but if you look carefully, you can see it come in the shot. It's easier to, depending on how dark your screen is. (00:20:40)
Continuity mistake: When Maren is looking at her Walkman in the diner before tearing out the cassette, right after pressing on the buttons, her thumb changes position between shots. (01:34:57)