The letters remaining on the Stark Tower are incorrect.
At least one archery trophy is shown in young Kate Bishop's room BEFORE she asks her mom for a box and arrow.
When Hailee grabs the drink tray from the other waiter in the basement it has 4 glasses of champagne on it but in the following shot it only has 3.
In the shot where Kate's father enters a room, there is a carabiner hanging on the wall to the left of the door - that carabiner is the Petzl vertigo wire-lock, not released until around 2016 or 2017, whereas the scene is set in 2012.
The location of the hotel at which the charity auction takes place is given as Park Avenue at 68th street, but the Lotte New York Palace Hotel is actually at 455 Madison Avenue, near East 51st Street.
It is never explained why the Track Suit Mafia wanted to get the Rolex watch.