Other mistake: Bandit and Snowman are traveling to Texarkana, TX to pick up the beer. Texarkana is in the extreme East border of TX. When you see Sheriff Justice pull up to the guys trying to steal parts off Frog's broken down car, you see "Montague County Sheriff" on his police car door. Montague county is in Northern TX, about four hours away from Texarkana. Bandit and Snowman didn't travel that far into TX to pick up the beer, why would Sheriff Justice be so far away from his jurisdiction?
Other mistake: Just after Bandit and Snowman leave home for the trip to Texarkana they have to drive through some rain. As the Trans-Am approaches the camera there is someone in the passenger seat even though Bandit is alone in the car and they haven't picked up Frog yet.
Other mistake: When we first see a shot of Bandit's CB radio, you'll notice that it's a Pace Cb-166, and the microphone has a circular Pace logo. Later in the movie when Bandit picks up Frog, and he's holding the mic up as she's rambling to trying to get off her wedding dress, you'll see the mic has a different rectangular logo (still a Pace model mic, but different from the one initially shown. (00:18:06 - 00:25:13)
Other mistake: The stop sign at the side road that the van pulls out from is actually facing in the direction that the Bandit is coming from and not the direction the van was coming from.
Answer: The trailer appeared in a recent episode of "The Walking Dead"
The trailer on the walking dead episode is a replica it's not the original one used in the movie as the one in TWD is a standard low slung with air baffles the original one doesn't have those and is also refrigerated.