Revealing: The wires holding up Scrooge, as he is lifted to see the ghost of Christmas present, are visible.

Revealing: The wires holding up Jacob Marley's floating lock box and chains are visible.

Continuity: When Isabel is breaking off the engagement with Scrooge (in Christmas past), the eye color of Scrooge changes to brown and then back to blue.

Continuity: When Cratchett gets the bird from the shop, it's clear that the bird is a duck. But throughout the entire film he's referred to as a goose.