Red - S2-E4

Continuity mistake: When Chloe tells Pete about her discovery about the Red meteor rocks, she gives a sample to Pete who then looks at it. At this time the red meteor embedded in the rock is above Pete's left index and middle fingers. Cut to a close up of Pete's ring and the rock but now the rock is embedded in between Pete's left index finger and thumb.

Nocturne - S2-E5

Continuity mistake: Byron mom buys him a book by Edgar Allan Poe at the used bookstore. Byron takes it with his right hand and looks at it. Cut to a wider angle (as Byron stands up) but now he is holding the book in his left hand.

Duplicity - S2-E3

Continuity mistake: When Dr. Hamilton was about to pour liquid kryptonite on Clark, Pete hits him on the back and he goes crashing onto a table knocking everything on it off the table. Yet later we see an open bottle of liquid kryptonite on the edge of the table (which was cleared by the doctor earlier) dripping onto the doctors forehead.

Obscura - S1-E20

Continuity mistake: As Chloe leaves Clark calls out her name. In the shot from Chloe's side of the room, Clark is holding the pitchfork horizontally low in front of him. The shot switches, as Chloe finishes her turn, and now Clark is holding the pitchfork with his arm bent so that the pitchfork is no longer low in front of his waist.

Spell - S4-E8

Continuity mistake: While Clark is chained up, Chloe uses her fingernails to dig into Clark's chest. You can see that since Clark has had his powers taken away her fingernails draw blood. In the shot of Clark screaming in pain you should see where the blood came from the scratches but there is no blood visible.

Nicodemus - S1-E15

Continuity mistake: When Lana and Clark are sitting on top of the windmill, Clark's jacket changes from opened to closed to opened.

Smallville mistake picture

Hourglass - S1-E6

Continuity mistake: As Harry goes into the pond the second time the pylons are connected now with yellow crime scene tape when the camera is out over the water looking at Harry on the walkway. As the camera is in the water, watching Harry fall in, the pylons are gone, even though they should be in the shot, and are connected by a wire instead of crime scene tape.

Smallville mistake picture

Craving - S1-E7

Visible crew/equipment: When Clark and Chloe begin their investigation on the deer, when Clark pulls the blinds, you can see the shadow of the crew equipment on the left side of the blinds.

Asylum - S3-E9

Continuity mistake: As Clark stands outside the room where Lex has just got his shock treatment the blood on his cheek is back even though his cheek wound was healed and he wiped any residual blood off in the previous scene at the power generator.

Asylum - S3-E9

Continuity mistake: When Lex first tries to break out of Belle Reve, he stabs a security guard in the leg with a pencil deep enough to draw a large amount of blood on the guy's pants leg. But when Lex is trying to incapacitate the man you can see the pencil flopping around on the guards leg and not sticking inside the guy's leg.

Asylum - S3-E9

Audio problem: When Lex gets outside and makes a run for the gate you hear the sound of Lex running on a gravel or small stone covered walkway. However, several time we are shown his feet and he is actually running on a regular concrete walkway.

Exile (1) - S3-E1

Continuity mistake: When Chloe and Lionel finish their discussion in the cave the shot focuses on the Naman/Segeth glyph and focuses through the glyph to a transition shot of an island that Lex is on. When we first see this island it is flat and covered with trees. The next time the island is shown there is now a large volcano/mountain that was not their when we first see the island.

Skinwalker - S2-E10

Visible crew/equipment: After Kyla dies the scene goes to the construction site as Martha and Lionel get out of a SUV. As Martha gets out you can see the camera and film crew reflected in the window of the SUV.

Suspect - S2-E13

Continuity mistake: When there is a flashback of the shooting, the police officer is heard to fire 3 shots, yet in each other flashbacks it's 2 shots and there are only 2 wounds in the victim.

Witness - S2-E20

Revealing mistake: Clark tries to stop the three guys who are inhaling refined kryptonite. As Clark gets tossed through a window, you can see the explosion of a small charge in the bottom left of the widow. Highly noticeable since Clark hits nowhere near where this charge goes off.

Exodus (2) - S2-E23

Continuity mistake: As Jor-El is first burning the mark on Clark's chest the mark moves to the upper right part of his chest. In the next shot, closer in on Clark, you can see the same area again but now there is no mark where there was one before.

Vortex (2) - S2-E1

Continuity mistake: When Clark, Pete and Chloe were searching for Clark's father in the woods, they stumble upon a motor home dropped by the tornado. Chloe then picks up a Nixon's camera and looks at it. Cut to Nixon and Jonathan Kent then back to a wide shot as we see Chloe throwing the camera down onto the ground. Clark then uses his X-ray vision once again. Cut back to a wider angle (as they walk away) yet we see Chloe throw down the camera once again.

Heat - S2-E2

Revealing mistake: In the sheriff's office, the door to the jail area has no lock plate on the wall.

Gone - S4-E2

Continuity mistake: Gabe Sullivan's headstone is on the right side (if you are looking at the headstones) of Chloe's in the previous episode. In this one it's on the other side.

Jinx - S4-E7

Continuity mistake: Chloe makes an $80 bet with Mxyzptlk at the beginning of the episode. When he pays her in the Torch office, he peels off seven 20-dollar bills for a total of $140 instead of the $160 it should be.