When Jami gets a call from Corey's cellphone, it says "12:40p" on her phone screen. Considering it was the middle of the night, that time is incorrect.
When Jamie is on the laptop reading about the original murders from "Infomania", the article is misspelled as "The Town that DREDED Sundown".
Towards the end of the movie when they are chasing the killer in the pit, the Texas Ranger has a rifle in his hands for a couple of scenes but then when he goes to shoot at the killer he has a handgun which he uses to shoot at the killer. They have different guns as they chase the killer and shoot at him.
At the beginning of the film, the annual tradition of showing the original The Town That Dreaded Sundown plays at a drive-in. In real life, it is played at Spring Lake Park which is not a drive-in theater. Cars are parked in the parking lot and the audience views the film in portable chairs or on blankets in an open field.
In the town meeting scene, the subtitles give the location as "Perot theatre-Arkansas side". It's actually on the Texas side.
When Jami and Nick are talking to Charles Pierce Jr, he tells them that Sewell was in custody when McCreedy was killed. In real life, the prime suspect was arrested after two months since McSpadden was killed.
Charles Pierce Jr also states "It should have been front page news but while Arkansas police were finding' McCreedy, the Texas police were arresting Sewell." Truthfully, the police did not find each one at the same time and the story of McSpadden was on the front page of the May 8 edition of the Texarkana Gazette.
Two movie posters in Charles' home show hilariously false translations of the movie title into German and French. Among other mistakes: in German, the word order is messed up. In French, the word "Sundown" isn't even translated but treated like a proper name.
There is no Hwy 6 near Texarkana, and the Perot Theater doesn't look like that on the inside. It is much bigger and more luxurious.
There is no Alamo High School in Texarkana. The four high schools that are in Texarkana are Texas High, Arkansas High, Liberty-Eylau, and Pleasant Grove.
The news report of Kendra and her marine boyfriend, Corporal Daniel Torrens, has Kendra's last name as Collins, but the online article Jamie reads has Kendra's last name as Thompson.