Not spoilery per-say, but under a cut anyway:
Putting the plot and story aside, there were 2 main things that bugged me in this episode:
1. When Clark was reading his mail at the end of the episode, the flag on the mailbox was up. If the mailman had already delivered the mail, the flag should be down. I guess you could argue that Clark was mailing those letters and had put the flag up and then saw the note that Lois left in the mailbox. It still bothered me though.
2. On Kelly & Brian's Facebook account, they said something about being excited about a song they got the clearance to use at the last minute. However, this song turned out to be one they've used already. It was from Veritas- when Clark goes to visit Lana in the hospital and she's comatose/taken over by Brainiac and sitting in the wheelchair and Clark cries over her. I don't even know the name of the song, but the chorus is "I was wrong..." I can't see any storyline reason for repeating this song and it's one that I think most people will remember, so WTF?