When the receptionist at the advertising agency sends Gladys "down the hall" to see about renting the Colombus Circle billboard, she's wearing a dark shirtwaist dress with a white collar. When she knocks on the door and he calls her in, she's wearing a print dress. Later, out on the street, she's back in the first dress.
In Peter's home movie, Evan is filmed driving towards him in the middle of the street. But when Evan actually arrived, Peter was down some steps next to the building, unaware of the Jaguar's approach, and not even filming.
The fictional New York TV station on which Gladys appears has call letters KXIW. Call letters for radio and television stations located east of the Mississippi River all begin with W; Ks are assigned only west of the Mississippi.
When Gladys goes on "The People Speak" and is obviously reading from cue cards, she breaks the word "getting" into two halves, as if the word wrapped: "get-" ending one line and "ting" starting the next. But when the cue card is shown a moment later, "getting" is in the middle of a line, not wrapped.
Around ten minutes into the movie, Pete asks Gladys her home address. He writes it on a card. She says something like, "1065 West 145th St., Apt. 9", but Pete puts pencil to card and then starts putting it away before she finishes telling him the address.