All that needs to be said about this movie *contains spoilers*
i don't want to insult anyone or be a jerk and rain on anyone's parade but it needs to be said about this DARK COMEDY.
it sucks and isn't done well at all. just watching the movie with that in mind (that it is a dark comedy) doesn't help. it just isn't funny. maybe it was the choice of casting that ruined it. perhaps if Jim Carrey played Seth Rogan's character and portrayed the character like he did in Ace Ventura Pet Detective or like in the Cable Guy it would have helped. seth rogan acts the same way in every one of his movies. he is a one note actor. i enjoyed him in the 40 year old virgin and in Pineapple Express but he essentially plays the same character all the time.
IMHO i don't think anything could save this movie.
let me use a scene from the movie to elaborate. Take for instance the scene where Seth Rogan's character shoots that guy he was trying to capture who goes around flashing his genitals, not funny. shooting an unarmed man who has not exhibited any violent tendencies is funny?? it is disturbing.
if anyone does find it funny, they should literally, right now, start looking in the yellow pages or on the internet for a psychiatrist AND call that psychiatrist and make an appointment. Please do not miss that appointment and during your session, make sure you tell the doc that you find senseless violence humorous. Just tell the doc you find this movie funny. you probably will be committed to a mental hospital, but it will do you so much good AND upon your release remember to always take your meds.
i know that someone with a seriously deep mental problem is going to reply and say that "You don't get the movie. it is making fun of movies that are overly violent for no reason" (see, i know what's going on). well, the writing does not make that apparent at all nor does the acting. it is so subtle (if present at all (and it isn't)) that anyone, even with an ounce of intelligence, misses the boat.
if you want to see movies that parody other movies or offer satire on life: watch National Lampoon's Loaded Weapon 1 from back in the early 90's. It pokes fun at the Lethal Weapon movies. watch the Naked Gun movies, and the tv series as well, for parodies of police dramas done with a very dry subtle humor at times and in a much much more effective way.
For satire watch Monty Python and The Holy Grail or the Life of Brian which pokes fun at religion. Oh my God it is so funny and the Brits know what they are doing.
If you want to see a dark comedy that is done much better, watch the Cable Guy.