Continuity mistake: After Barry draws Vandal Savage to show the team what he looks like, he tucks the pencil being his ear. Several shots later the pencil disappears. (00:11:45)
Trajectory - S2-E16
Continuity mistake: At the very beginning when Cisco throws a rock to the river beside Barry, the sun changes between shots.
Revealing mistake: The sequence at the start showing a "normal" day shows a coffee shop with the Flash supposedly running out with two coffee cups.When we see his day now without super speed, the shot of the coffee shop is just a continuation of the previous one, with the same guy walking through the door. In fact if you go back and look closely at the first shot, you can just see the edge of Barry, hidden behind another customer.
Character mistake: The way Henry takes Barry's blood pressure, he will not get any results. Neither the blood pressure cuff nor the stethoscope work reliably through clothing. As a doctor, he should know how to do it right.
