"By the way, Disney's live action Beauty and the Beast opens today," the smart speaker said after listing the time, weather and travel update.
In a video posted on Twitter, it then talked about the plot and suggested asking it about main character Belle for "more movie fun".
Google denied that the material on Home was an advertisement.
It appeared as part of a "My Day" feature where the digital assistant provides an update which can include calendar events and news bulletins.
