Is it agreed that this is a recent recreation? If so I would concur about the color of the telephone. Plus a secretary likely would have been using a shoulder rest attachment on the handset, plus most offices as I recall were a little slow to adopt touch tone and that's an earlier, non-modular set. (The paper I worked for didn't switch until shortly before they installed the Atex editing mainframe.) And the pen set seems a little out of place for a secretary. So you would be essentially imitating an imitation. Maybe a better produced film from that era instead?
Also, at the time, wasn't almost all color intended for reproduction shot on chrome?