When Mac looks up Peyton's phone number and tries to call her, he receives an automated message that the number is no longer in service. The recording, however, sounds like those typically used in the United States. Since Peyton's phone number is British, a British recording should have been employed, with different tones and a voice with an English accent.
Mac falls several stories, yet the EMTs doesn't have him in a neck brace when he's put on the gurney. Highly unlikely they would take such a risk without having x-rays or something to show his neck isn't injured.