Factual error: When testing the new phone installation, the engineer only dialled the number, and not the area code, as you have to do on a mobile phone.
Other mistake: Mari said she had a shag in a Chevy, but it is an Oldsmobile.
Continuity mistake: When LV begins her big concert, she carries a microphone on a cord. But after her first song, a stand instantly appears on stage without any stage hand moving from the wings.