Jimmy attacks Davis from behind but, when the camera shifts, Davis is facing him.
When Clark is typing "Goodbye note" from the "Red-blue blur", the message is shown on the screen, and few seconds later the word "goodbye" is zoomed in. Above the "goodbye" is written "And if I die" which was not in the original text (when the whole text was zoomed out on screen).
When Davis is talking to Chloe about the Greek myth of Persephone he states that she chose to stay with the beast in the Underworld. In the actual myth, Persephone's mother Demeter begged the other gods to force Hades to release her, but Hades said that Persephone had eaten six pomegranate seeds and thus must be forced to stay in the Underworld for six months of each year. It is during this time that Demeter is sad and does not keep the world green, which is why winter exists.