Deliberate mistake: When Violet and Klaus have the anchor on the three cans they use to roll it on, just before they tip it over the edge, it is obvious the anchor isn't a real anchor. It's too light. When they keep pushing it back and forth, it should tip over because of the weight if it was a real anchor. They shouldn't have been able to handle it like that. (01:01:45)
Continuity mistake: Right after Violet and Klaus break the beam which is supporting them during the storm, they begin to run forward in one shot. However, when the angle differs in the next shot, they begin to run forward again. (01:02:00)
Continuity mistake: When the Baudelaires jump over from the broken piece of the house over to the rest of the house, as they land, you can see to the right that there is a big hole in the wall where there should be a window with sprinkles. As they run out of the house, right before it falls in to the lake you can see the sprinkles are suddenly mended. (01:02:05)
Continuity mistake: When the rest of the house breaks off and falls in to the lake, a small piece of wall remains left with the entrance where the Baudelaires are standing. The broken planks left in that piece differ in the close-up shot of the kids and the remaining entrance. (01:02:10)
Continuity mistake: When the children sail away from Curdled Cave with their aunt, the rudder of the boat is missing. The rudder is seen in the shot when they go in and the little baby is at the helm. (01:03:15 - 01:05:40)
Continuity mistake: When the Baudelaires arrives at the Curdled Cave and Aunt Josephine says "You deciphered the clues in my note" she is holding both hands over the edge of the rock on which she is lying. When it cuts only one of her hands are over the edge. (01:04:35)
Continuity mistake: When the Baudelaires and Aunt Josephine are on their way from Curdled Cave, Klaus holds up the paper drawing of the Eye. He then folds it when Josephine says they all were investigating the fires. When it cuts, he folds the paper again. (01:06:05)
Continuity mistake: In the scene where Violet, Klaus, Sunny and Aunt Josephine are being attacked in the boat by the Lachrymose leeches, you can see Violet has her hair down. When Count Olaf pulls up to them in his boat, Violet has her hair tied back with her ribbon. (01:08:05)
Factual error: Before the Leeches attack the boat, Aunt Josephine throws out her banana peel. After she is abandoned by Olaf, the peel finally floats to the surface. A banana peel wouldn't even sink that low especially at the angle Aunt Jo threw it at. (01:10:05)
Continuity mistake: When the children are on Olaf's boat after Aunt Josephine has been eaten, Mr. Poe and the detective arrive. When Poe says he was wrong about Olaf, Sunny's hood is covering part of her face. When the camera goes to the orphans, you can't see her face at all because she is leaning in to Violet, and when the camera goes back to Olaf, her hood is completely off her face. (01:10:55)
Continuity mistake: Before the play when the man with the arm prostheses takes care of coats he is handed over a coat on his right hook and a hat on his left hook. When it cuts the coat is on his left hook and the hat is gone. (01:12:00)
Continuity mistake: Before the play when Klaus pulls the "Inheritance Law and You" book out of the camel head prop he has his left arm all the way inside the camel head. When it cuts the Camel head is gone from his arm. (01:12:15)
Continuity mistake: When the two ladies are done singing before the play the carpet on the stage is open wide. When it cuts to a close-up of Klaus looking around you can see in the background that the carpet is closed. (01:16:30)
Continuity mistake: In the last scene, when Klaus is in the tower and the light shines through all the mirrors, it is made quite clear he is standing right in the path of the light. Yet, when he walks up to the eye, he no longer is in the light's path. (01:21:20)
Factual error: When Klaus first finds the Eye, if you look closely at the light beam just as it exits the eye, it is curved like a vortex. Light cannot do this; it should have been straight more like a cone shape. (01:21:25)
Continuity mistake: The marriage certificate that Violet signs and the one that is burning in Count Olaf's hands are not the same. If you look at when Violet signed it she didn't leave a dot over the 'i' in Baudelaire. The one that is burning has that dot. (01:22:35 - 01:24:25)
Factual error: When Klaus burns the hole through the certificate, Count Olaf looks right through the hole into the magnified sunlight. His eye would be severely damaged if looking into sunlight through such a powerful magnifying object. (01:24:25)
Factual error: Olaf and Violet's marriage certificate bursts into flames after the light from the magnifying glass hits it. The papers would not burst into flames, despite the size of his magnifying glass, it should have just burned a hole. Obviously done to be dramatic. (01:24:25)
Continuity mistake: When the marriage certificate bursts into flames, the red thing on the certificate in the lower right corner has long threads hanging from it. The length of the threads differ between shots. (01:24:25)
Continuity mistake: When the crowd is approaching Count Olaf after the marriage certificate is burnt and Olaf says "Not to mention, setting a terrible example to the children", the character played by Cedric the Entertainer is walking among the crowd. When it cuts, Cedric suddenly cuffs Olaf. How did he get on stage that quickly? (01:24:55)
Chosen answer: On the beach, where Mr. Poe comes to inform them of the fire as the movie starts.