When Jaqueline Gibson is running from a man who is following her, she backs against the wall in an alley near the Ivy Lane stage entrance and her nails are painted as she searches the wall beside her. In the next shot, when her hand suddenly finds the man's arm, her fingernails are unpainted.
The opening text reads: "I run from death, and death meets me as fast, And all my pleasures are like yesterday." The movie attributes the quote to John Donne's Holy Sonnet #7. But it is actually from Holy Sonnet #1.
When Mary Gibson describes her sister to the Italian couple who own the restaurant she has just entered to inquire about her sister, she says she is tall with dark hair. However, when her sister is first seen a little later in the film, she is shorter than Mary (not tall herself). She therefore could never be described as being tall.
The quote from Donne misspells his first name as 'Jonne' rather than 'John'.
When Mary is searching for Jacqueline in the hotel hallway, the stairway railing moves when Mary puts her hand on it. A real handrail would not move so easily.
Early in the film, a private detective claims, "Manhattan is only nine miles long and four and a half miles wide." Manhattan is roughly 13.4 miles long and 2.3 miles wide.