Smallville

Lana is running a blood drive, and she, Pete, and Chloe all volunteer to donate. They're 15, but American Red Cross blood drives require you be 17 or older to donate.

When Amy comes over to talk to Clark, he is seated at a table almost directly in front of the Jungle Lord pinball machine. In the preceding episode, the machine was in a different location, there was no lamp next to it, and the position of the machine is such that Lex couldn't have been standing in the previous episode where the table is this episode.

Trivia: Amy's shrine for Lex features an article about the bank robbery from "X-Ray."

When Clark is hit with the mace, it shatters; it is impossible for iron to shatter under normal temperatures and with the small amount of force that a regular human can put behind a swing, no matter what it hits.

When Clark and Lana are on Lana's porch about to kiss, Clark's head is tilted to the right when the camera is behind him, and switches to the left when the camera is behind Lana, this goes back and forth a few times before Lana's aunt interrupts them before they can kiss.

At the end of the episode when Clark is watching Lana and Whitney on her porch, they switch the shot to one from in front of the telescope where we can see a reflection of Lana and Whitney in the lens of the telescope. Unless they were sitting 3 feet from the telescope, their reflection would not appear in the lens, and definitely not when her house is a mile away.

Somehow between when Victoria steps into her bath (with her hair completely dry) and the time she sits down and lies back, her hair gets wet.

On several occasions, Clark doesn't feel the effects of the kryptonite that the invisible attacker has covered himself with. This includes when Jeff attacks him, when the door is slamming and the invisible man brushes past Lex, Clark, and Victoria, when Chloe has the oil on her hands.

In the credits for later episodes, a clip of Lex and Clark from this episode is played. However, in this episode, Lex is on the right, with Clark standing behind him as they both go to investigate the mysterious happenings going on in Victoria's room. The scene is right before they open the door and a close shot of Lex and Clark as they approach it. In the credits of later episodes, the same clip is a mirror image, with Lex on the left and Clark behind him.

So, Clark invites Lana to see the sunset "tomorrow". Night passes, it's a new day, Clark goes to school, sees the medicine. It's night, Clark goes to Lex, talks about the medicine, and Victoria almost gets killed. Now, it's day again and Clark goes back to school! Clark talks to Whitney about the medicine, Clark talks to Lex again, and then sees the sunset. So Clark and Lana didn't watch the sunset "tomorrow" but rather "the day after tomorrow."

So does Clark also have telescopic vision? When he sees the medicine vial in Whitney's bag with his x-ray vision, he's some distance away but is able to clearly read the name of the medicine.

The usual ignored problems of being invisible: - How do you see if light either goes through your invisible eyes or (as appears to be the case here) is bent around them? - If Jeff's eyes aren't covered by the invisibility stuff, shouldn't they be visible? - When Jeff leaves the bathroom and cuts himself on the glass on the floor, his blood is visible. If the blood was visible, which it should not be, then why wasn't the cut on him visible?

Lex comments that he "knows everything that goes on in this house." Not only was he unaware that Clark got into the house a few minutes earlier, but crooks, reporters, and his father wander in and out throughout the season and Lex doesn't seem to have a clue.