Perhaps the director must have thought he could have some fun with it and generate easy laughs, and in turn it is more of a gimmick than anything else. (qwipster.net)
I also think some laughs were good, but I hate how Disney (and also Dreamworks) looks down on kids with easy laughs and formulaic quirks in their characters, and how their stories in the end don't have to really hold up as the author here points out (found the same with Frozen). (cinemixtape.com)