When Kai gets out of the taxi for the first time and submits his Visitor card to the security at the entrance, the guard scans his card for verification and tells him 'Forty Third floor.' But there are only 23 floors marked in the elevator and he pushes the button 23.
When Mark arrives in Thailand and the customs agent welcomes him in English, it makes no sense for him to reply "mahalo", which is "thanks" in Hawaiian, but not in Thai. (However, the character's passport states he was born in Hawaii, and this may simply be 'establishing his character'.)
The investigating police officers refer to Fha as Vanida Golten the actual name of her actress.