When Pelant threatens Booth, he says that he will kill five innocent people, a teenager listening to music, a couple, and an old man playing chess. That is only four people.
When Pelant hangs up on Booth after taunting him, Booth hears a dial tone. Cell phones don't have dial tones.
Palant's chessboard in the opening scene in oriented incorrectly. The lower right corner square should be white.