In the scene where Linda is abducted in the subway station, one of the advertisement posters in the background is for the 1986 film Soul Man (1986).
Set in 1964, when Linda talks on her home phone with Heinz, the phone handset is clearly seen to have a modular plug connection to its cord. The now-popular modular plugs were not introduced until much later in the 70's.
Apart from a French's "Mustard of the World's Fair" (1964) ad, prominently featured in focus behind principals in shots of longer duration, the only one accurate to the time period of the film's setting, all the rest of the ads in the subway abduction scene are from 1986, the year of the film's production.