Goofs

When leaving the airport in his brother's van, the steering wheel is on the left-hand side. The scenes going forward the steering wheel is on the right-hand side.

In the final scene when the camera zooms out, Hadley is wearing the heels that she had previously traded for sneakers.

When Oliver meets his brother at the airport, a couple of British Transport Police officers ask them to leave. British Transport Police is the national special police force that polices the railway network of England, Wales, and Scotland. It does not police airports.

When Hadley is on the bus traveling to find Oliver, the narrator says she "averaged 17 kilometers per hour". While England uses the metric system for most measurements, they still use miles for distances.

When the couple comes out of the memorial in Peckham, they sit next to the River Thames to talk. Peckham is over 2 miles from the Thames.

Per IMDb guidelines, " If a character steps out of a building in one part of town and walks a block down the street to another building that you know is three miles away, this is not a goof, it's "creative geography" and is a widely used cinematic device."

The wedding takes place in the UK, but it is an American-style wedding, with the bridesmaids entering before the bride.

However, there is no rule that a customary or particular style of wedding must be performed based upon geographic location.

When Hadley is booking her new flight, the London Stansted logo is visible on the screen above the gate desk, despite the location supposedly being New York JFK.

When Hadley is being introduced, Ryanair planes can be seen in the background. Ryanair does not fly to New York JFK, the setting for this scene, but Stansted, where this was filmed, is one of their hubs.

When Hadley and Oliver leave the restaurant table to run for their flight. You can see some equipment on the floor under the table, connected to a cable running along the skirting board.

They read on the invitation that the reception is at the Navy College but when the outside of the location is seen, it is clearly at the Queen's House across the road in Greenwich Park.

Luther describes his van several times as a Sprinter, which is made by Mercedes. When the van is finally seen, it is clearly a Ford Transit van. When Hadley first meets Luther, he even says again "it's a Sprinter", yet the "Transit" name on the door of the van is prominently in the centre of the frame.

The gate agent is pretending to use the computer at the desk when Oliver and Hadley are boarding the flight. The screen shows that the agent is not even logged in to the computer.