Continuity mistake: When William Petersen is on a cordless phone at work, he says "the guy gives me the creeps and the girl is my daughter." As he does, the phone cord appears, and the phone's position changes as he hangs it up.
Continuity mistake: In the scene where they are the roller coaster, Reese Witherspoon has nail tips on, then 20 seconds later she doesn't, then she does again.
Continuity mistake: Near the end of the movie, when Mark has the mother and father bound and gagged, the mothers tape gag slips off and is magically resealed several times.
Continuity mistake: There is a change of scene from an inside shot to an outside shot in the first hour of the movie. There is an extremely obvious skip in the film where it was edited.
Continuity mistake: When David talks to Nicole in her Jeep, at one point her hair is over her shoulders. Then they show David again then back to Nicole and the hair is behind her shoulder and it keeps repeating through out the scene.
Continuity mistake: When the girl and hear brother are playing the video (before Mark Wahlberg and his friends try to break in), the game they are playing are from the Street Fighter series and the sounds coming from the game are wrong, those are Asteroid type sounds.
Continuity mistake: At the end scene when Mark Wahlberg and his friend are attacking the girls in the bedroom, keep an eye on Reese Witherspoon's left shoulder. Her shirt repeatedly changes from torn and her bra strap showing to being intact and the strap covered up quite a few times within the scene.
Continuity mistake: When Mark Wahlberg is chasing after Alyssa Milano in his car, they go to a shot of her driving in the background it is water but when it cuts back to him it is trees, also a car comes in the opposite direction but it never passes any of them.
Continuity mistake: David tells Nicole that her dad hit him in the chest and left bruises. But later in the film when David is carving on his chest, there are no bruises.
Continuity mistake: The wound on David's back from being stabbed by the peace pipe at the end changes drastically. When we first see it, it is a very bloody wound on his upper back near his shoulders and head, but when we see it in the next shot, not only is it smaller and less bloody, but it also changes position to being further down in the middle of his back. (01:30:45)
Continuity mistake: David throws Nicole in her pool yet in the next scene when he kisses her, her hair is dry.
Answer: Not enough information was revealed in the short scene to make any conclusions and there was no concrete evidence that a (dog-related) crime was being committed. There was not even any indication that a dog was present. One might GUESS that David and his friends prepared dogs for illegal dog-fighting or trained dogs to be dangerous, aggressive watch (or "attack") dogs, but there is no proof. "We're here to see a man about a dog" may sound suspicious or shady, but could mean something as innocent as looking for a lost pet. [00:38:36]. There is a second "clue" much later in the movie when Mr. Walker is talking on the phone: "They're running their own cartel and you can't do a goddamn thing about it"? Mr. Walker probably saw some evidence when he broke into their house. While it might be assumed he means a drug cartel, not all cartels are drug-related. But, relating this scene to the earlier one, it appears "We're here to see a man about a dog" is the code for wanting to buy drugs. (The man who answered the door replied, "Does this look like a kennel?") David and his friends/gang appear to have been selling drugs out of their home. [01:15:55].
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