Other mistake: After Terrance shows the painting of Matilda and she runs off, if you keep an eye on Terrance as the screen pans upwards when there isn't a lot of his body left, he randomly disappears when the pigs appear in the shot.
Angry Birds (2016)
1 mistake
Directed by: Clay Kaytis, Fergal Reilly
Starring: Peter Dinklage, Jason Sudeikis, Josh Gad, Maya Rudolph, Bill Hader, Danny McBride, Kate McKinnon
Answer: It is almost certainly playing on the trope that clowns (and comedians) often have issues with anger or depression, although they are assumed to be happy and fun.
Sierra1 ★