Continuity mistake: During the execution scene, the executioner moves the ribbons of the hat "to see better" but when the angle changes the ribbons are where they were before.
Continuity mistake: In the beginning of the film when Alice is laying in bed her father shows her how to wake up from a dream by pinching herself. He demonstrates by pinching her upper arm on the bicep. Switch camera angle and he is pinching her on the shoulder, when the camera switches back he is once again pinching her arm.
Continuity mistake: When the red queen is sitting in her chair and she is talking with Ilosovic Stayn, her lipstick is heart shaped. But when the camera switches to the side, her lips are fully covered in red and when it switches back it is heart shaped again.
Visible crew/equipment: After Alice rejects Hamish's proposal she does a bit of the Futterwacken, and when it cuts to a shot of everyone in front of the gazebo, the blue tape mark can be seen on the grass in front of Lord Ascot. It looks like there's also a yellow tape mark on the grass in front of Faith Chattaway. (01:38:15)
Revealing mistake: In a close-up, just after the defeat of the Jabberwocky, the White Queen collects the Jabberwocky's blood dripping from its teeth into a vial. Cut to a wider shot with the vial just over half full, you can see that the drips are still being caught by the vial (ie, they don't drop past it onto the ground), but the level of blood in the vial doesn't rise, revealing that it is done in post-production.