The Broken Ear: Part 1 - S2-E2
Revealing mistake: After losing the parrot, a man is shown writing a "missing parrot" note. After finishing the first line, we can see last word goes over the desk. (00:08:55)
The Broken Ear: Part 1 - S2-E2
Revealing mistake: When one of the villains throws a knife onto a target board, no knife mark is made afterwards. (00:14:15)
Chosen answer: It is a pill that makes alcohol taste disgusting.