In one scene, Katy Perry is seen receiving an award at the 2011 American Music Awards before the film cuts to a backstage scene of Lady Gaga that actually takes place at the 2011 MTV Europe Music Awards.
In one scene there is a shot that shows a building, where it states that it is 'Zurich, Switzerland' yet in the windows of the building you can see the word 'tandlæge' which is Danish for dentist. The shot is most likely from Copenhagen and not from Zurich