In general the movie is correct. It has some flaws, like at birth the first emotion of the protagonist is the joy, but from there on I find it hard to find fault, as far as psychology is concerned.
However the film has a plot quite easy to tell, and does not aspire to much. Treating pixar expected the emotions of a girl who detected cancer, or that one of their relatives passed away, typical of disney. Without a doubt it would have been much more interesting than a pre-glamorous and consenting.
Let's add that the characters do not suffer from real dangers.
As a commercial product is fine, but is far from being a good movie.
I really expected pixar to surprise me this time, but there is no doubt that pixar is no longer the shadow of what it was.
By the way, Bing Bong is a plagiarism of Dee Dee's imaginary friend from dexters lab