Zoe says she is going to Turkey to take a break but her mother says that she is flying to Constantinople which is a place that doesn't exist. This is a misunderstanding. Constantinople is the historical name for Istanbul, the capital of Turkey. Zoe's mother's use of Constantinople instead of Istanbul demonstrates that she is old or old-fashioned.
The premiere takes place at the Curzon Mayfair, which is about a mile from the River Thames, but when Zoe goes outside during the screening, she's on the Embankment.