There is a suitcase beside Gordon as he sits on the park bench. When he leaves the park with Rosemary, Gordon does not carry the suitcase with him although it is no longer beside the bench.
During a scene in the office, Rosemary is sitting at her desk talking to her boss. The light reflects off her glasses, giving off a green tinge, indicative of anti-reflective lenses - not invented during the time the movie takes place.