Plenty of wackiness occurs in “The Extra Man” and each crazy incident is designed to showcase the idiosyncrasies of these two nutty characters — the callow, introverted youth and his tempestuous mentor — and to provide two fine comedic actors with big juicy wads of masticatory grist, whether it's a ritualistic morning free-form interpretive dance or a tutorial in how to urinate on the street without attracting undue attention.

Co-directed by Robert Pulcini and Shari Springer Berman ("American Splendor," "The Nanny Diaries"), and co-written by them with Jonathan Ames from the latter's novel, the movie aggressively pushes its whimsicality to the point where it feels less whimsical than just aggressive. It's often funny, but I didn't laugh much because the looniness is so blatant there's no room for the freshness of discovery. In other words, I didn't often feel like I was being allowed to notice any details for myself that weren't already being shoved in my face.

The filmmakers assign each character one or possibly two off-the-wall traits: a hirsute man (John C. Reilly) has a squeaky speaking voice; a Russian is also a hunchback; an emaciated, unhealthy-looking girl (played by Katie Holmes) who works at an environmental magazine is also a vegan snob; a rich lady likes fast-food chicken; a fat lady has a bum leg that hinders her mobility, physically and socially. These designated peculiarities are evidently designed to show that, well, isn't everybody just a little weird, really?

Meanwhile, so many quirks are piled upon Henry's character that his eccentricities have eccentricities. Henry seems to have but one desire in life, which is not to be known or understood by anyone. He is largely successful. Every time you peel back a layer of the onion, all it reveals is yet more onion.

We know Kline can play kooky (he won an Oscar as Otto in "A Fish Called Wanda"), and he does it very well, but the effort can become exhausting after a while. Dano takes more of a silent clown approach to his self-doubting character. At times Louis' wispy frame, burdened by the weight of all his uncertainties and inhibitions, droops like an overwatered tulip.

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