Not only did Jenna Ortega learn to play the cello, she took fencing, archery, canoeing, German, and boxing lessons to prep for her role.
Wednesday very rarely blinks. She only seems to blink when she is injured or caught off guard. The idea came after trying one take where Jenna Ortega didn't blink, leaving director Tim Burton "so enamored with the result he told Ortega not to blink anymore when playing Wednesday. So she didn't." Then, during her appearance on TODAY, Ortega said: "She doesn't blink. [Tim Burton] likes it when I tilt my chin down and look through my eyebrows, like a Stanley Kubrick stare, and then I relax all the muscles in my face." Ortega did express that she "got kinda annoying about it on set" and that they "would have to restart a take if I started blinking because sometimes you start crying." "[It was] Romanian winter; there was all this wind in my face," she concluded. "I learned to blink on other people's lines."
At 6'6" Romanian actor George Burcea is the shortest actor to play Lurch. Lifts in his shoes make him appear taller on the show.
As Christina Ricci replaced Thora Birch after filming had already begun, several scenes had to be reshot. Paying close attention during the first few episodes, it can be seen that Ricci acted in front of a green screen as none of her shots feature other characters (others are only seen from behind) and are static shots (without movements).
The creators got a lot of mileage from the height difference between Principal Weems (played by 6'3" Gwendoline Christie) and everyone else, especially Wednesday. Weems towers over the rest of the cast and is often filmed from a low angle to accentuate her height. Christie said in interviews she loved the glamorous look of the character.