Continuity mistake: When Zoolander, Hansel and Matilda are drinking the tea near the end of the movie, the "steam" in Zoolander's cup keeps on changing to from overflowing the cup, to half way down and none. This is without ever refilling his cup. He can even be seen blowing some of the steam out and next thing it's full again.
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.
Revealing mistake: At the funeral when Derek is giving the eulogy a tombstone on the right of screen almost falls over in the wind.
Audio problem: When Matilda is in her car with Derek and on her cellphone with the anonymous hand model he hangs up on her and you hear a dial tone, yet on a cell phone, there is no dial tone.
Revealing mistake: When the projector screen gets rolled up, the picture of the Prime Minister rolls with it. It's painted on, not projected.
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."
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.
Factual error: There is one scene towards the end when Matilda is talking to her assistant and two clocks showing the times of Tokyo and Hong Kong are visible on the wall behind. In reality Tokyo is one hour ahead of Hong Kong, but the clock clearly shows Hong Kong as one hour ahead of Tokyo. The Frankfurt clock is also an hour slow, assuming the Chicago clock is the correct one.
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.
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.
Continuity mistake: At the Derelicte show, Derek is getting his makeup put on. He has black eyeshadow all around his eyes and it kind of "stretches" down his face. When he comes out onto the runway, his eye makeup is different.
Continuity mistake: When Derrick and Matilda arrive at Hansel's, watch Hansel's turquoise necklace. It goes inside and outside his shirt a couple of times, while talking at the door.
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.
Continuity mistake: When Hansel is rappelling down to the D.J. booth, he has gloves on. When he stands up, the gloves are gone.
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.
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.
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.
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.
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.