Factual error: In the scene where Karen plays the album "Both Sides Now" by Joni Mitchell, she cries to the title track "Both Sides Now". A shot of the CD player indicates that track 7 on the album is playing, but "Both Sides Now" is track 12 on the actual album. (01:29:00)
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.
Factual error: When the little boy Sam is running through Heathrow airport to say goodbye to Joanna, he is in terminal 1. Virgin Atlantic flights only depart Heathrow from terminal 3. (02:00:15)
Factual error: In the scene where Colin lands at the airport in Milwaukee, the sign outside the airport says "Milwaukee International." The actual name of the airport is General Mitchell International. (01:23:35)
Factual error: When the President of the United States arrives at 10 Downing Street, his car has Washington State license plates.
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.
Factual error: Daniel and Sam are prevented access to the gate area by a security guard at Heathrow who is sitting at a desk and yet when Joanna comes back through to kiss Sam, the guard station is unmanned. This position would always be guarded.
Factual error: In the scene where Natalie goes to see the Prime Minister in his office, she is holding a buff coloured folder marked: 'SECRET - TREASURY DEPARTMENT'. However, folders within Government/Ministry of Defence etc are colour coded as follows: Red or Pink for Secret, Green for Confidential and Buff for Restricted & Unclassified for the obvious reason of ease of identification and security.
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.
Chosen answer: Irrelevant when it comes to soundtracks, Girls Aloud released a version of Jump to coincide with the movie's release and the video for the song featured scenes from the movie, hence its inclusion.
GalahadFairlight