Revealing mistake: At the end of the episode, Courtney asks Maria to cover her for a bathroom break, as the Crashdown is full of customers. She goes straight into the Crashdown bathroom, which is right there by the entrance to the kitchen. After she gets through, she walks back out, but you can tell that she's walking out onto a soundstage - there's no other part of the Crashdown outside of the bathroom as she exits.
Destiny (2) - S1-E22
Revealing mistake: Throughout the scene where Max interrogates Pierce, the projector changes slides at irregular intervals with no one touching it. (00:22:50)
Answer: It's called "Here With Me", performed by Dido. It can be found on her album "No Angel".
Tailkinker ★