The title (This is What Happy Looks Like) is slang. " I believe you could also read the expression as shorthand: "This is what (a person who is) happy looks like. The Simpson quotation, if correct, is not good grammar.
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moon7296"This is What Happy Looks Like - Goodreadswww.goodreads.com/.../15790873-this-is-what-happ"Along with Dr D's comment, you can also say " this is what BEING happy looks like".
moon7296Q2) Also, I heard one line from "Simpson The Moive," saying "That's what sung is."At http://www.englishdaily626.com/movie_lines.php?317 the line is actually "So that's what snug is". "snug" / "sung" looks more like a typing error somewhere than a mishearing