Revealing mistake: When Lana has her nightmare, she wakes up in a room and discovers various people on pedestals, underneath body sheets. During the scene, some of the people under the sheets can be seen lightly breathing, although everyone under them is dead.
Factual error: When Lionel is leaving the prison, there is a bus unloading convicts as he walks past. No prison in the world would ever unload inmates and release an inmate in the same area at the same time.
Trivia: When Clark confronts the Flash in his hotel room, he reads off the fake IDs Jay Garrick, Barry Allen and Wally West. Those are the secret identities of the first three men to be called the Flash in the comics. Also, this Flash says his name is Bart, like Bart Allen, the teen hero formerly known as Impulse and currently being called "Kid Flash." (00:10:35)
Question: Why does Clark keep burning his "S" symbol on the sides of buildings after saving someone? I get him doing it under the influence of red kryptonite, but at this point it just seems like vandalism that Superman would never do. Clark even saw Chloe having to scrub his mark off the wall of Watchtower, which wasn't an easy task. And if it's meant to be a symbol of hope against crime for the people of Metropolis, why burn it into the side of the refinery in Smallville after putting out the fire?