When Otis Tucker is changing his flat tire at night, some shots show a long stretch of road behind him which is clearly lit up with broad daylight.
If the attorney could be hosed off to get clean, it means the house has plumbing, which makes the outhouse redundant.
At then end of the flashback about Otis Tucker, he is stated to have never regained consciousness after his encounter with the creature, meaning that no one could possibly know that it even was an encounter with the creature or any of the details of how it happened. A likely explanation is that Dr. Lockhart simply took an account of an unexplained murder and added his own details, including arbitrarily attributing it to the creature with no evidence. Otherwise, it's simply a massive plot hole.
When Lockhart and Tim encounter the deer carcass in the road, Lockhart says, "It doesn't matter, Charlie", alluding to the actor's real name.
When waiting for the girls at night, Tim calls Lockhart "Pop". Chuck Pierce Jr., who plays Tim, is the real-life son of Charles B. Pierce, who plays Lockhart.
At one point, Lockhart calls Deputy Williams "Trooper Williams", when he had referred to him as "Deputy" up until that point.