Deliberate mistake: In the orphanage scene, Santa's bag drops dead center in the fireplace. The noise of the impact gets baby Buddy's attention in a quick shot, and the camera shifts back to the fireplace. Now, the bag has shifted to the viewer's left when Santa's boots are coming down. The shift of the bag is presumably to make room for the boots coming down the chimney.
Elf (2003)
1 deliberate mistake - chronological order
Directed by: Jon Favreau
Starring: Will Ferrell, James Caan, Zooey Deschanel, Bob Newhart
Continuity mistake: In the scene in Central Park as Santa speaks with Michael, Santa's arm is either on the book of Christmas lists, or off it, as the scenes switch between looking over Michael's shoulder and over Santa's shoulder.
Buddy: We elves try to stick to the four main food groups: candy, candy canes, candy corns and syrup.
Trivia: Will Ferrell actually walked down Lincoln Tunnel in full costume, causing several minor accidents.
Question: Has anyone noticed what looks exactly like a Buddy Elf doll standing on the kitchen counter during the breakfast scene where Buddy is pouring syrup for the mom? If you pause when the camera pulls back to show Buddy pouring syrup and the back of the moms head, you'll see the elf doll on the right side of the scene (our right, Buddy's left) facing away from the camera. It's on the counter directly below the cabinet knobs; behind the back of a chair and in front of what looks like a radio that sits against the counter wall. Ideas? Looks just like a Buddy doll to me.
Answer: This was probably deliberately added to the scene. Movies often add in-jokes like this. I believe it was "HP and the Chamber of Secrets" that while Harry, Ron, and Hermione are in Diagon Alley, the entire Harry Potter book series can be seen on a shelf in the background. In "Raiders of The Lost Ark," there are a little C-3PO and R2D2 carved into the stone hieroglyphs in the Well of Souls. "Jurassic Park" openly displayed JP merchandise, the same merchandise that was sold in stores. Filmmakers love to add little "Easter eggs" like that for audiences to find.
Answer: It might just be a regular elf doll that, coincidentally, is dressed in real elf clothes.