When Lawrence and Martha stop to get a bite to eat on their way back to London from the airport, Lawrence is seen reclining on the hood of his car. In the first shot, there is nothing on the hood with him. In the next shot, there is a burger and a drink.
When Martha and Daniel meet at the curb outside the airport, there is an extra carrying a large gray bag. He is walking away, going to Daniel's right.
When Martha and Daniel begin talking the same extra (minus the bag) is walking away from Martha, going the opposite direction he was before. The camera cuts to Daniel and then back to Martha and the extra has disappeared completely.