
Continuity mistake: When Harry and Cedric are transported to the cemetery, the Triwizard cup lands on the grassy slope, well beyond the Riddle monument, with its luminescent top facing away from the cauldron area. During Priori Incantatem, three shots after Voldemort exclaims, "He's mine!" the cup lies on the corner of the Riddle monument's stone base and it faces the opposite way. The cup is back up on the grassy area in the following shots. (01:19:00 - 01:28:40)
Answer: Not at all. In fact, David Heyman made the decision for his eyes to be blue in the films for him to be more scary! They felt that his red eyes in Sorcerer's Stone did not show enough emotion to make him an evil character. It was felt in Goblet of Fire that the light blue eyes would be perfect to show his evil in the moonlight, and they kept it on for later films.