Deliberate mistake: At one point they use a Red Ryder BB gun (Yes, just like in A Christmas Story) and the guy says "You pumped it more than twice, didn't you" to his female counterpart when they shoot the bird. Red Ryder BB guns cannot be cocked/pumped more than once, due to the simple nature of the toy gun that it is.
Failure To Launch (2006)
1 deliberate mistake
Directed by: Tom Dey
Starring: Matthew McConaughey, Kathy Bates, Sarah Jessica Parker, Zooey Deschanel, Justin Bartha, Terry Bradshaw
Continuity mistake: When Paula has just shot the guy in the back while playing paintball, the next scene shows her walking toward the three guys and it looks like she still has her paintball attire on. In the next shot, it shows her close-up and she has a tank top on.
Jeffrey: My teacher Miss Kramer has a girlfriend.
Paula: Oh, that's nice.
Jeffrey: She's a lesbian.
More questions & answers from Failure To Launch
Answer: It's called "Not Bad at All" by Steven McDonald.
Myridon