Czolgosz calls his security bird "Ptak." Ptak is Polish for bird.
The Polish subtitles which appear on screen when the bird squawks is roughly translated to "the special effects in this film are questionable at best."
A scene in the first draft of the screenplay revealed that Czolgosz commands a small, armed brigade whom he orders to attack the McKinley robot but are brutally decimated. The scene was written out when it was deemed too violent.
An alternate climax to the film involved Czolgosz being thrown from a waterfall. A full-size dummy was constructed but the scene was never shot due to difficulties experienced on location.