Continuity mistake: Mohinder and his friend enter Sylar's apartment. He's wearing a white shirt. In one shot, when he finds Sylar's secret room, he is wearing a dark jacket.
Suggested correction: It's not a dark jacket. It's still his shirt but since he's in the shadows, it just looks darker. You even see when the light swings you can catch a glimpse of the shirt.
Continuity mistake: In the scene where Sylar and Mrs. Bennet begin to talk, she becomes suspicious about his interest in Claire. When Mrs. Bennet picks up the phone to call her husband, Sylar visibly moves his finger to use his telekinetic power right before the angle changes. In the next shot, Sylar again does the same motion with his finger, but this time the phone is removed from Mrs. Bennet's hand.
Continuity mistake: When Claire Bennett is cutting Peter Petrelli's chest she makes two cuts then the angle changes and the blood is gone, the angle changes again and it is back.
Continuity mistake: When Claire is looking at the "Alice in Wonderland" dust jacket, she holds in one hand looking at the back cover, then in the next shot, she's holding it with both hands looking at the front cover. (00:24:40)