There are numerous times when the immediate filming area is of course being rained on, but down the street a clearly sunny, dry day can be seen. There is also several "rainy" scenes with bright sunshine falling on buildings across the street.
At the start of the film, it is early autumn at a college in easy commuting distance from Manhattan. The trees are still mostly full green, indicating late summer/early Autumn. However later in the same day the main characters arrive in Manhattan they are at a hotel on Central Park, and the trees are in full Autumn colors. This would indicate at least a month difference, as beyond any day to day local variance, Central Park benefits both from the "heat island" effect, as well as being on the coast.
In short, the trees in Central park remain green long, long after trees just outside the city, and for hundreds of miles south have turned to Fall colors.
In short, the trees in Central park remain green long, long after trees just outside the city, and for hundreds of miles south have turned to Fall colors.
When Timothy and Selena share a taxi there are numerous angles with Selena's hair behind her ear and others with it across her forehead.
In the restaurant Francisco Vega, when asked by Ashleigh what wine they are drinking, says Chateau Meyney. The bottle, however, is from Chateau Margaux.
When Ashleigh meets Gatsby in the restaurant after the failed hookup with Francisco, she has her flats on, however, when she left Francisco's place, it was shown that she ran out, without any shoes on.