The Season 4 DVD contains all 22 episodes from the fourth season of Smallville with deleted scenes and commentary. The DVD was released on 13 September 2005 in the U.S. and 10 October 2005 in the U.K. The cover depicts Clark Kent with Lois Lane behind him, foreshadowing their famous relationship.
Clark Kent will have plenty of reasons to remember his senior year! The thrilling reinterpretation of the Superman legend evolves in Season 4, whose 22 episodes include the quest for 3 Kryptonian crystals... and Clark's bold attempt to keep those mysterious stones from destroying Earth. Clark also becomes a highly recruited football star. Lana gets a boyfriend. Lois Lane — smart, opinionated and entirely annoying to Clark — comes to Smallville. This season also shows how Chloe learns the scoop of the century. Lionel becomes a straight-up nice guy. Lex steps further from the light into darkness and a new calling awaits Clark - an awakening to a destiny that only he can accept and fulfill.
It was Jeannot Szwarc's idea to show the witches in a cart in the opening scene. The scene was originally going to take place in a castle.
Costume designer Caroline Cranstoun mentioned to Allison Mack that the same group of people are used as extras for various scenes. They all knew each other when they came for the wardrobe fitting.
A man came on to set and taught Kristin, Erica, and Allison all about Latin and the various styles of Latin. They decided to use the Italian style on the show. In addition, the man taught them about witchcraft, how to cast spells, and how to hold their hands when doing so.
The scene with Clark and Lois bickering about Chloe's birthday party was originally going to be shot outside, but it had to be pulled in the barn due to rain. That scene was shot the same day as the witch scene.
Kristin accidentally hurt herself when she pulled out a few of her own hairs.
Apparently, Clark isn't the only one who could use a "woman's touch" with gift-wrapping: Allison's brother used to pay her to wrap Christmas presents.
The musician who played the piano while Lana cast a spell on Lex studied for seven years at the Moscow Conservatory.
Tom Welling is always wandering around the set going, "Clark's an IDIOT!" Clark is one of the few people who wouldn't immediately take advantage of a situation where Lana is suddenly into him. The cast remarks that Tom is very good at playing awkward and blank.
The purple potion Lana created was actually grape Gatorade, which was sickening to the cast.
It is very awkward to film dancing scenes since the music is always turned off for the dialogue, resulting in everybody dancing to nothing and having a different rhythm. Erica Durance was very concerned abut her dancing. Contrary to Clark, Tom Welling is actually a great dancer in real life. During that scene, he was wearing his socks and dress shoes along with his boxers.
When Clark was shooting heat vision at various objects Chloe threw at him, Tom was just staring at nothing while filming the scene. It was also Tom's idea to have Clark ask for Chloe's help, and then have Allison's witch pretend to show emotion for Clark. Later in that scene, Allison kept tripping over Tom's legs when she had to walk backwards.
John Litvack, one of the producers in LA, has a picture of Kristin, Allison, and Erica dressed as witches hanging up in his office.
According to Jeannot Szwarc, the Kawatche Caves set is dusty and hard to light. Allison, Erica, and Kristin found it hard to walk in the mulch while wearing their high-heeled boots.
On the first take when Kristin grabbed the stone, she screamed and collapsed.
Erica comments that her favorite part of the scene where Lana, Chloe, and Lois are restored to normal is the fact that they are all passed out on the floor of the caves. Clark only helps Lana get up, and Chloe and Lois have to get up themselves.
In the very first draft of the script, Isobel visibly stayed in Lana. When Lana left, you see a "thing" in her eyes, showing that Isobel was still there. This scene was never shot because the crew and writers would feel trapped by it.
Kristin Kreuk was sick during the filming of this episode. At the start of filming, she lost her voice. In her last scene with Tom, her voice is slightly crackly.