When Catherine is holding Viviana's card against the checkbook register, at first, the card is at the top of the register, but in the next shot, the card is flush with the bottom of the register.
When the woman at the start of the show jumps off the apartment balcony and hits the bus, the bus is shown as being in motion. When Nick walks onto the balcony and visually recreates the scene, the body is shown as falling straight down onto the bus. The bus is directly below her apartment. Since the bus was moving at the time of the impact, it would no longer be aligned with the balcony from which she had leaped.