Things You Can't Outrun - S1-E3
Other mistake: When Cisco and Cailtin call Barry to tell him about the man with the gun, Cailtin says he has a gun. Cut to the cops pursuing him, the perp shoots at the cops, and one of them seems surprised that he has a gun. There's no way Caitlin could have known about the gun without the cop knowing (which would presumably have been relayed over police communications).
Going Rogue - S1-E4
Continuity mistake: When Captain Cold shots Joe with the ice gun, he hits Flash instead, in the left side of his abs, but in the next shot the ice switches sides.
Barry Allen: My name is Barry Allen and I'm the fastest man alive. When I was a child, I saw my mother killed by something impossible. My father went to prison for her murder. Then an accident made me the impossible. To the outside world, I'm just an ordinary forensic scientist, but secretly I use my speed to fight crime and find others like me, and one day I'll find who killed my mother and get justice for my father. I am The Flash.
Going Rogue - S1-E4
Trivia: Kahndaq is mentioned heavily in this episode. Kahndaq is a fictional country, home to DC anti-hero, Black Adam.
King Shark vs. Gorilla Grodd - S5-E15
Question: Since David Hayter voiced King Shark, why not have him portray him in his human form of Shay Lamden?