Smallville Season 7 Episode 18

Jor-El and Lara are nowhere to be seen, despite the fact that it's established that Lara placed baby Kal-El in the spaceship before its departure.

For some reason, with the destruction of Krypton imminent, Brainiac doesn't kill baby Kal-El immediately. Instead he picks the baby up, places him on a pedestal, looks around for a crystal dagger, and then finally gets around to killing him. It would be simpler and faster to simply crush in his skull or strangle him.

Despite the fact Kara has been on Krypton for some time (long enough to send several journal entries, over a period equal to her absence in the present), she still has enough super-strength to lift a heavy boulder over her head and smash Brainiac with it.

In the Kent family photo that Clark picks up the alternate reality Clark is too tall. In the episode we can clearly see that Brett Dier is shorter than Tom Welling, but in the picture he's taller than Jonathan Kent. The photo had been digitally enhanced with Dier's face superimposed over Welling's.

Even before he has his epiphany near the end, Clark tells Adams that "he never gives up." But the beginning of the episode begins with Clark... giving up. If he never gave up, then the entire situation wouldn't have happened.

The timeframe of the altered timeline is unclear: Lex is President and Lois has presumably won a Pulitzer. The implication is we're seeing a point further in the future then Clark's present. But none of the future versions of Clark's friends and family look any older, and the "new" Clark appears to be the same age as Clark.

It's a common problem seen in many shows involving time travel, but... they talk as if Clark could disappear any second once Brainiac kills his past-self. But from Clark's current-day perspective, Brainiac has already killed Clark, 19 years ago. Ditto for Kara leaving him messages: there's no reason for them to "suddenly" appear, they should have been there during the past 19 years.

While it makes sense that Clark may have underestimated Lex's gun, allowing himself to be shot with a Kryptonite bullet, and afterwards be too weak to dodge the second shot, it makes no sense that Kara, after seeing Clark shot twice, would have just stood there waiting to get shot herself.

At the end of the episode, when Kara drops the milk bottle, she drops it right in front of her. However, when Kara drops to the floor, and twists to her left, the milk puddle is in front of her. The milk should have been by her legs behind her on screen left if she dropped it the way she did.

As Lois is taken away, and Clark and Kara talk about what Lois has done, the closed captioning continues to display what Lois is saying even though she can't be heard on-screen.