When Rose and Jack run through the dining room with Cal shooting them, notice that the floor is tilted to reflect the ship sinking. In the next scene when they run down the stairs, the floor is now perfectly level. There is no tilt to the floor. Notice how the water tumbles out of the door - it falls on a flat surface and disperses evenly with no angle to it.

During The Black Widow's interrogation scene, she hits one of the guards in the face with the back of her head. However, the back of her head does not make contact with his face at all, only her hair does.

During the scene when Katniss is looking for Peeta, Katniss wades across the river. When she steps out she is wet up to her thighs. When the camera changes directions, and she sees the blood, her bottom half is dry, even though she was just in water.

In the first close-up shot when the Prince's aide is complaining about the salmon-pink clothes the Queen has given him to wear, his collar is buttoned closed. In the next close-up shot it is open with silver hook and eyes visible. In the third close-up shot it is buttoned closed again.

When Oz is talking to Mia outside near the start, she puts her hands on her shoulders when she says "that's so cute!" In the next shot they're lowered, and she puts them on his shoulders again.

When the kids are reading the book about cinema, Hugo's right hand appears / disappears randomly next to the book between shots.

The first few projectiles fired on the destroyers by the aliens are taken out by a phalanx CIWS. However these systems use radar to track their targets, and the aliens have jammed all radar, so it shouldn't be working.

The nuns (including Mother Superior, Sister Mary-Mengele and Sister Rosemary) don't age despite the fact during the course of the movie about 25+ years pass.

When Moreau is brought to the room and sat on the chair, her hair swaps from messy to brushed between shots.

The phone handsets in every shot are Cisco 7940 which are VoIP handsets. This technology was not available in 2002.