Continuity mistake: Batman got rid of the two goons through non-lethal falls, and he is about to face Scarecrow. Scarecrow has his escape planned; he has his right hand on a lever by the armrest...or in the next shot, on a lever above him. (00:18:05)
Continuity mistake: Scarecrow's boots start out dark red then they're light brown later in the episode.
Continuity mistake: Batman tears off the front of The Scarecrow's collar. Yet later in his hideout it's fine again.
Be A Clown - S1-E11
Continuity mistake: The Mayor is giving an inauguration speech. Look at the crowd in the long shot. It cuts closer, and you can see that the man in cowboy hat that was in the crowd moved behind the mayor on stage. A journalist in red tailleur also switches to lilac. (00:01:20)
Be A Clown - S1-E11
Continuity mistake: Summer Gleeson points the microphone at Mayor Hill while she has her left hand on a broken beam that is either absent or at different angle when they pull him out of the rubbish. (00:02:50)
Be A Clown - S1-E11
Continuity mistake: Joker splats a full cream pie on the mayor's face. When he walks away, the screen has mostly cleaned itself. (00:03:40)
Be A Clown - S1-E11
Continuity mistake: The first time we see Jordan in his room, a huge monstrosity of a doll is propped against the door. This puppet reaches the knob of the door while in a sitting position. Then a few seconds later his dad enters the room, and the doll is at his ankles. (00:04:00)
Be A Clown - S1-E11
Continuity mistake: Jordan puts down his hat when his dad arrives. The hat is on opposite ends of the table between shots. (00:04:25)
Be A Clown - S1-E11
Continuity mistake: In the overhead shot of "Jekko" that pushes the cart with the cake, next to a waiter with a red towel there's a man in an orange shirt. Next shot and his shirt is blue. (00:07:55)
Be A Clown - S1-E11
Continuity mistake: When Bruce Wayne plays clumsy and fends the crowd with his large package, the same people (like the elderly woman with the big hat) move out of his way multiple times in different shots. (00:09:05)
Be A Clown - S1-E11
Continuity mistake: The VHS tape on top of the TV screen is positioned 90° differently between the opening shot and the next. (00:11:05)
Be A Clown - S1-E11
Continuity mistake: Batman sees the Joker and the kid on the roller coaster platform, but he's animated going in a different direction instead of just hopping over the rails. (00:18:35)
Be A Clown - S1-E11
Continuity mistake: When Batman jumps on the tracks to start chasing Joker, the lever that starts the attraction is on the wrong platform. (00:18:45)
Be A Clown - S1-E11
Continuity mistake: The Joker pounces Batman when he gets on his cart. When they are fighting in the background and Jordan reacts to the sight of the tracks ahead, the cart is much longer than it should be. (00:19:45)
Continuity mistake: The Clock King slashes Batman's chest logo with his clock hand cane leaving it sliced up. A few shots later it's intact.
Continuity mistake: The boat with the gas-emitting garbage goes past the bridge, and its odor approaches the bridge trailing behind, from the left of the screen. A few seconds later it also intoxicates the street workers, but the miasma approaches from the right. (00:02:00)
Answer: She escaped off-screen and created a copy of herself to fool everyone.