Continuity mistake: When Scrooge walks into the Cratchit home at the end, there is a "Home Sweet Home" plaque on the wall. The shot then cuts away from it. The next time the plaque is visible, its lettering has changed.
Continuity mistake: When Scrooge wakes on Christmas morning, he puts his foot through his hat. It has a huge hole in the top when he leaves home, but when he puts it on Tiny Tim's head, it's undamaged.
Continuity mistake: When Jiminy takes Scrooge to Fezziwig's, all the windowpanes are frosted over and Scrooge wipes off one pane, so he can see inside. In the next scene showing the inside of the building, the frost is gone from all the panes.
Continuity mistake: Near the beginning when Scrooge is talking to Bob, the coins on his desk change and disappear depending on the angle.
Continuity mistake: When Rat and Mole enter Scrooge's office to ask for alms for the poor, the wall clock shows the time as 9.00. After Scrooge sends them away with no money, the clock shows the time as 6:57.
Continuity mistake: When Scrooge arrives at the home of Bob Cratchit, you can see there is an "X" at the bottom of the front door. But in a long overhead shot of Scrooge discovering that the Ghost of Christmas Present is gone, the "X" is missing.
Continuity mistake: When Scrooge opens the door to the Counting House, you can see that there is a bell by the door, but when we see Scrooge entering the Counting House in the next shot, the bell has disappeared.
Continuity mistake: After Scrooge wakes up from the Ghost of Christmas Future, he tries to find a way out of the bed curtain and you can see that there is no curtain behind him, but in the next shot one suddenly appears.
Continuity mistake: When Jiminy Cricket (The Ghost of Christmas Past) jumps on to Scrooge's bedside table, the time on the alarm clock reads 2:00. In the next shot, when the curtains move and Scrooge hears the dinging, the time reads 1:00, and when we return to Jiminy Cricket in the next shot, the time reads 2:00.