Many posters listed the movie as Zack and Miri, while others looked like the page image without the title at the bottom, carrying the tagline "Seth Rogen and Elizabeth Banks made a movie so outrageous that we can't even tell you the title"
Most of the DVD covers also have the title as just Zack and Miri. Presumably, places such as Walmart would not have stocked the movie under its full name.
Not just posters, but also TV ads. Kevin Smith once complained about the NFL banning trailers of his films during games, saying they were inappropriate, but allowing commercials for beer and ED prescriptions.
Harpo Does Something Funny: One of Kevin Smith's only films to allow extensive improvisation, as all the performers were famous for their lengthy ad-libbed scenes from Judd Apatow films.
Moral Guardians: They didn't take too kindly to the film, the poster or even the title. Which is probably why the movie was released on DVD in many places as simply Zack and Miri.
Playing Against Type: Of a sort; Jason Mewes gained fame by playing the foul-mouthed, aggressive and abrasive Jay (of and Silent Bob fame) in The View Askewniverse. In this movie, his character is still a complete doofus, but he's a lot more pleasant, calm and good-natured.
Production Posse: Two separate production posse's here, both Kevin Smith's (Jason Mewes, Jeff Anderson, producer Scott Mosier, DP Dave Klein) and Judd Apatow's (Elizabeth Banks, Craig Robinson, Gerry Bednob).
Reality Subtext: The filming of the porno is an awful lot like the way the filming of Clerks. has been described. In particular, filming in the workplace after hours and the use of a microphone taped to a hockey stick as a boom mike are both shout-outs to the filming of Clerks (although Clerks was filmed with the knowledge and permission of Smith's then-employer).