The film begins on a Friday night, yet Jane is shown going to her secretarial job at an insurance company on the next morning, which would be Saturday. It isn't likely that a New York City financial company would have a fully-staffed workday at their offices on a Saturday. Also, the date shown on Jane's bank deposit book after she receives the gift money was a Friday, not a Saturday. Less than 18 hours had passed, so it could not have been the next Friday.
After Donn breaks the window, Jane sits down on a couch. Behind her on the wall, a moving shadow of the boom microphone is visible.