Helen Pryor meets her new college classmates at the Vinyl Crocodile. They announce that they have bought some Frank Sinatra records, and that now Helen has to buy some of their music. They immediately hand Helen a small stack of 45's.
Except that among the 45's is a record on the Uni label (it's the one with the red-tan colored sleeve). As a label, Uni did not exist until the mid-to-late 1960's. Seeing this record, out of place with the rest of the 45's in the scene, broke the illusion that the show would portray a scene from 1963, by putting in records and materials that existed in a later time period.