When Booth and Pelant are fighting in Pelant's house, the amount of blood on Pelant's face changes inconsistently between shots.
When Hodgins is photographing the triangle on the wall he uses the flash in his camera. The flash would override the black light, causing all of the photographs to show nothing.
The ceremony depicted at the end of the episode is not a Catholic baptism, in keeping with Booth's beliefs. In the Catholic Church, new babies are baptized, not christened, and the ceremony requires the attendance of Godparents who take a vow to see to the baby's religious education.
Due to the fact that Brennan knew the victim, she should never have been allowed to investigate it at all.
Then again, this show is known for not following the law.
Then again, this show is known for not following the law.
When the message Sawyer wrote on the wall is revealed, part of it is hidden behind a nightstand. Hodgins then photographs the message, but without moving the nightstand, meaning that his photos of the message would show it incomplete.