Factual error: The place where Jamie is writing his novel is revealed to be Marseilles, France, when he flies back to propose. In the first part of their story, it might have been Portugal; his housekeeper spoke French, which is a common second language in that country; and Aurelia only spoke Portuguese. Yet in the entire second part, no-one speaks any French at all; only Portuguese and a few words of English. Sure enough there are many Portuguese families living in France; but they do not have their own linguistic enclave in Marseilles, and any generation growing up there would have learnt French as well. Either the language or the airport name are wrong.
Suggested correction: In the second part, only a few people are heard speaking Portuguese. They are mostly Aurelia's family or friends of the family. It's reasonable to assume that these few people spoke Portuguese.
Other mistake: Considering how long the Prime Minister's car is parked outside in front of the only road into the school, where there is to be the school Christmas concert, it's surprising how many cars are still trying to find a parking space. Also, you can see that no cars are driving when Natalie gets out of the Prime Minister's car.
Suggested correction: These just sound like observations. What mistake is being highlighted here?
Factual error: When the President of the United States arrives at 10 Downing Street, his car has Washington State license plates.
Suggested correction: Without information about what state it should be, it's difficult to claim this is a mistake.
Factual error: I know it's a romantic comedy, but no way could an eleven-year-old outrun airport security, find his way around an airport without getting lost or caught and be returned to his dad without even a telling off.
Suggested correction: As you say, it's a comedy; some suspension of disbelief is required throughout.
Factual error: When Billy Mack hears he is No. 1, the DJ, (Radio 1's Wes, who does the chart in reality) says the two singles which could be No. 1, then announces Billy is and plays it, without playing the no. 2 song first. The chart is done as an uninterrupted countdown, so even if it's known what no. 1 will be, they'll still play the "losing" song before it.
Suggested correction: In this instance, the DJ broke with protocol.
