Ronnie is writing in a journal, but when he tears out a page to discard it, there already is writing on the next page.
Amber's Sennheiser radio Mike transmitter is visible in a couple of scenes. In the cafe she has a square lump in the back of her bra.
When she walks away on the pier, the U shaped metal clip is visible on the back of her waistband.
When she walks away on the pier, the U shaped metal clip is visible on the back of her waistband.