Revealing mistake: When the projector screen gets rolled up, the picture of the Prime Minister rolls with it. It's painted on, not projected. (00:01:00)
Audio problem: The voice is the second female from the left, but her mouth does not move when saying "Perhaps you'd like to go back to turning out novelty neck ties in Hackensack." (00:01:45)
Audio problem: When Mugatu is talking to the designers, he says "14 days, that's fashion week, its impossible I have a show." That's not what his mouth is saying. (00:02:00)
Audio problem: When Matilda is asking Derek about the magnum look, Matilda says, "Thats intriguing.", but you can see her mouth is still moving saying something else. (00:04:00)
Continuity mistake: When Derek is being interviewed by a reporter on the red carpet, a woman with an afro passes behind Derek twice, without turning around. (00:06:22)
Revealing mistake: At the funeral when Derek is giving the eulogy a tombstone on the right of screen almost falls over in the wind. (00:15:55)
Continuity mistake: When Derek was giving the eulogy for his model friends, they show him from a distance and there is a barge slowly going by in the river behind him, within a second they switch to a close up and the barge is gone. (00:17:05)
Continuity mistake: During the 'Eugoogalizer' conversation between Matilda and Zoolander, look behind Derek, you see two men getting into a car next to the one Zoolander is going to climb into. As Derek is saying "Mugatu, if you knew anything" the men are about to get in but in the next shot they're already in the car. (00:17:45)
Continuity mistake: When you see Derek leaving the funeral and Matilda says his name, there is a nubian female with gold hoops around her neck next to her. The second time Matilda says Derek's name, this girl is gone. (00:17:50)
Continuity mistake: When Maury tells Derek Mugatu wants him for his new campaign, he points at Derek with his left hand. The very next shot you see his arm was never up in the first place. (00:19:50)
Continuity mistake: In the scene where Mugatu is talking to Mr. Ballstein, Todd gives Mugatu the phone to talk to Mr. Ballstein. The camera cuts to a shot where you see Mr. Ballstein in the bathroom. In the shot after that, Todd and Mugatu have switched places. (00:22:30)
Continuity mistake: When Derek Zoolander is being interviewed by Mugatu for the first time, when Mugatu's assistant brings him his drink and Mugatu spits it out you can see the drink all over the top of his mouth. Then you see him right away after that and it is gone. (00:27:10)
Continuity mistake: When Mugatu leaves from behind the desk to show Derek the model, the chair Mugatu spins does an extra 180 turn. The chair front is still facing the wall. (00:27:35)
Continuity mistake: In the Relax scene, when the girl says "I want you to relax", the first birds eye shot of her, her hands are behind her back, but when you see a close up view of her, her left hand is up. (00:31:45)
Audio problem: In the "Daiye" spa, when Derek is telling Matilda about Derelicte being the biggest campaign in the world ever, You hear Katinka say "What is this?". But you can see that her lips do not move. (00:32:30)
Continuity mistake: When Matilda is being thrown out of the day spa and Katinka tell's K-mart about her outfit, the door behind her is open. The very next shot of Katinka, the door is shut. (00:32:45)
Continuity mistake: When Derek is cuffed into the brain wash chair and the music starts, the speakers bump. In the very next scene when Derek says "I Love This Song", they are not moving at all. (00:33:20)
Continuity mistake: While being brainwashed by Mugatu, you see the cutouts of celebrities pop up. When Derek does his first flip down the runway, the cutouts are missing on the sides of the runway. (00:35:05)
Continuity mistake: When Derek is in the club telling Hansel "That's a walk off challenge, my friend," they are close together. When Hansel whips out the scooter, he's about five feet away, and then they are back together again. (00:42:00)
Continuity mistake: When David Bowie steps forward to Hansel and Derek, he grabs his hands around their shoulders. As the shot changes from Bowie's face to Hansel's, his hand is gone from Hansel's shoulder, but after the shot turns to Derek and then back to the view of the three of them as it was from the beginning, his hand is back. There's a shot of the back of Hansel's neck with no hand, the angle changes to the front again and the hand is back. (00:43:40)
Answer: It was raining and it was that water from before just running down the semi-sloped road.