Late in the film, Victoria "V.I." Warshawski (Kathleen Turner) returns to Smeissen's (Wayne Knight) hideout to get some information out of him. She goes upstairs to his office and, as a warning, fires her gun at a bowl of walnuts sitting on his desk. The film cuts to a reaction shot of Smeissen, then back to the wide shot. Several items on the desk have moved on their own. Most notably, the red file folder has gone from sitting under the bowl of walnuts to sitting next to it. The phone straightened itself out, and the walnuts that flew out of the bowl have drastically changed positions.
At the scene of the tugboat explosion, the fire engine is solid red. Chicago fire engines are painted a distinct black over red design.