Patsy Kensit previously played Mia Farrow's daughter in The Great Gatsby (1974), the filming of which is partially recreated in this film.
The heart wants what it wants.
Mia Farrow: The heart? You-you don't have one! I'd look a little lower.
Although Maureen O'Sullivan retained her Irish accent for her entire life, she is not depicted as having one in the film.