Character mistake: Tool neglects to dress Barney's tattoo after he completes it. Not something a professional tattoo artist would neglect to do, especially when he is tattooing a friend.
Suggested correction: Tool states that it's taken him several months to do the logo tattoo. It's also implied that he has done the rest of Barney's tattoo's. Barney, being the tough man he is, could have simply said in the past not to bother with dressing it and Tool has done as told against his better judgement.
Character mistake: When Johnny and Cleo leave the Chateau and head for Vegas, they are shown getting on the 101 freeway North (in Hollywood) and are coming from the east and turning right onto the freeway. The Chateau is in West Hollywood so to turn onto the freeway where they did, they would have come from the west.
Character mistake: Judy is meant to be Southern, evident by Fred saying she has a Southern accent two times in the movie. However, as we all can tell, Pixie Lott (Judy) actually speaks in her regular English accent throughout the movie. (00:15:17 - 01:01:41)
Character mistake: Blane refers to 21 Jump Street to counter the objection put to him by Chas regarding the age of the supposed Russian terrorists. 21 Jump Street didn't first air until 1987.
Character mistake: Two police officers went to the Davenport's house because someone "requested a drive-by in the middle of the night." The veteran cop rang the doorbell, knocked on the door, heard noise (dismissed as "probably a pet"), and even yelled, "Rise and shine, people." He told the rookie cop that he was "trying to go the extra mile to make sure these folks are okay" and "Somebody called in a drive-by and I want to see their smiling faces." The officers nonetheless left when they got another call. (00:19:19 - 00:20:41)