Visible crew/equipment: After Beauxbaton's entrance into the dining hall, Fleur bows in a close-up with the wood platform directly behind her, and then Dumbledore kisses Madame Maxime's hand. In the next shot, when Dumbledore quickly runs up onto the platform to introduce Durmstrang, there is a white mark on the wood which he promptly stands on. This mark is not on the platform in either the previous or following shots. (00:17:40)
Visible crew/equipment: In the dining hall when Dumbledore says, "Eternal glory, that's what awaits," it cuts to Harry and the other kids sitting at the table. Right behind Harry's seat you can see a white tape marker on the floor. (00:19:15)
Visible crew/equipment: In a number of shots within various scenes, the reflections of the reflector screen and set lights are briefly visible in the lenses of characters' glasses, such as Rita Skeeter's, or in characters' eyes.
Visible crew/equipment: The light of the camera is reflected in the glass behind Dumbledore as he talks to Harry immediately after the Pensieve flashback.
Visible crew/equipment: When Hermione and Ron are in the library with Harry before the second task, Moody walks in to tell Hermione and Ron to go see McGonagall, and just as Ron puts the golden egg on the table the actor's blue tape mark can be seen on the floor. (01:29:30)
Visible crew/equipment: After Fred and George drink the aging potion and jump within the "age line", right before they say, "Ready?" and drop their names into the goblet, at the start of this shot the actor's T-mark is briefly visible on the floor, just before one of the twins promptly steps to that area. A bit of a second T-mark is briefly seen as well, to its right, also where the other twin soon stands. (00:30:10)
Visible crew/equipment: When the camera moves to look into Moody's "pit-like" suitcase, you can see the shadow of the camera on the left.
Visible crew/equipment: The camera is reflected in the metal water container when Dumbledore walks down the stairs to attend to Ron and Fleur's sister during the second task.
Visible crew/equipment: Just as Dumbledore reveals the Goblet of Fire, Barty Crouch Sr. is behind him. Just under his feet you can make out the edge of a white tape marker. (00:21:10)
Visible crew/equipment: When Harry takes out the licorice snap it cuts him and when he bends down to get one you can see his mic pack. (01:38:50)
Visible crew/equipment: When Harry is in Moody's office after the third task, and Moody closes the cabinet door after searching for more potion, a crew member in a white shirt is reflected in the cabinet's glass.
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.