Continuity mistake: Just before Clark gets the call from Lana we see inside the trunk of Pete's car. At this point there is a coiled rope in the trunk turned parallel to the rear of the car. When Pete gets the rope for Clark a little later the rope is turned perpendicular to the rear of the car.
Continuity mistake: As Perry and Clark talk for the last time in this episode the sunlight in the scene changes between shots. As they step out of the truck the sun is behind them as they walk towards the road where the bus is going to stop. When Perry turns to face Clark the sunlight, which should now be hitting Perry right in the face, is instead casting a bright orange light on the back of Perry's head.
Continuity mistake: Lex and Clark are playing pool. Lex misses his shot on the 12 ball and scratches which leaves the 12 ball near the pocket. After Clark gets the cue ball, he makes his shot on a different ball and the 12 ball that was next to the pocket is gone without it being knocked into the pocket.
Continuity mistake: Jason accesses Lex's computer and Lex catches him. After a discussion on an email Jason found Lex says "Burying ladies in the backyard isn't exactly a hobby of mine, Jason." Lex then just stands there staring at Jason. During their stare down the camera jumps back behind Lex and then back to behind Jason. During these camera changes the lighting on the left side of Lex's face changes. When the camera is behind Jason, Lex's left side is dark. When the cameras is behind Lex, Lex's left side is lit up.
Revealing mistake: At the command center outside Martha is watching a monitor with the hostages on it and she asks "Where's Clark?". The next shot is one of Clark running down a hallway, inside the plant, using his super-speed. As he is running the red lights along the ceiling are revolving faster than they normally do and return to normal once Clark stops using super-speed.
Continuity mistake: At the beginning of the episode an announcer calls Jonathan's name and he appears almost immediately. Later on we see what happens backstage and when we hear the announcer call Jonathan's name. The second time through he has time to say a few last words with Lois, go to the edge of the curtain and take a breath before he steps out on stage. The timing of the two scenes don't match.
Revealing mistake: During the scene with Lana hemorrhaging after giving birth, and Lex being escorted out, we see him pounding on the door and disturbing the blinds, yet in all other shots of hospital rooms in Smallville, the blinds are on the insides of the rooms, not the outside of them.