During the climactic fire sequence at the end of the film, the fire is intercut with footage of horse-drawn fire trucks racing to the rescue. The footage of the fire trucks is clearly footage shot during the day, but the fire takes place at night.
When the crowd of gangsters floods into the entrance level of the hotel at the end of the film, one of the "columns" is knocked over, toppling easily, thus revealing it not to be connected to the interior structure of the building.