it is ok for a movie to be something of a sitcom apparatus , if the lines work , the humor has point and the actors are humanly engaged . 
(ROOT (S (NP (NP (PRP it))) (VP (VBZ is) (ADJP (JJ ok)) (SBAR (IN for) (S (NP (DT a) (NN movie)) (VP (TO to) (VP (VB be) (NP (NP (NN something)) (PP (IN of) (NP (DT a) (NN sitcom) (NN apparatus)))))))) (, ,) (SBAR (IN if) (S (S (NP (DT the) (NNS lines)) (VP (VBP work))) (, ,) (S (NP (DT the) (NN humor)) (VP (VBZ has) (NP (NN point)))) (CC and) (S (NP (DT the) (NNS actors)) (VP (VBP are) (ADJP (RB humanly) (VBN engaged))))))) (. .)))
(ROOT (S (NP (NP (PRP ))) (VP (VBZ ) (ADJP (JJ )) (SBAR (IN ) (S (NP (DT ) (NN )) (VP (TO ) (VP (VB ) (NP (NP (NN )) (PP (IN ) (NP (DT ) (NN ) (NN )))))))) (, ) (SBAR (IN ) (S (S (NP (DT ) (NNS )) (VP (VBP ))) (, ) (S (NP (DT ) (NN )) (VP (VBZ ) (NP (NN )))) (CC ) (S (NP (DT ) (NNS )) (VP (VBP ) (ADJP (RB ) (VBN ))))))) (. )))