schaeffer is n't in this film , which may be why it works as well as it does . 
(ROOT (S (NP (NNP schaeffer)) (VP (VBZ is) (RB n't) (PP (IN in) (NP (DT this) (NN film))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD may) (VP (VB be) (SBAR (WHADVP (WRB why)) (S (NP (PRP it)) (VP (VBZ works) (ADVP (ADVP (RB as) (RB well)) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ does))))))))))))) (. .)))
(ROOT (S (NP (NNP )) (VP (VBZ ) (RB ) (PP (IN ) (NP (DT ) (NN ))) (, ) (SBAR (WHNP (WDT )) (S (VP (MD ) (VP (VB ) (SBAR (WHADVP (WRB )) (S (NP (PRP )) (VP (VBZ ) (ADVP (ADVP (RB ) (RB )) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ))))))))))))) (. )))