In the opening scene, girl is listening to music on wired headphones that aren't connected to the phone. This is incorrect, she is using Bluetooth headphones that are connected to each other by a chord around her neck. As you can see later in the episode she is using the same Bluetooth headphones with the ear buds connected to each other without the chord to the phone.
At 9:02, when Rachel's dad is eating his cereals, he blows on them as if it's hot.
Despite being set in California, South African traffic signs are visible. For example, one indicating a pedestrians/cyclist path is visible by the high school.