The meeting time to exchange the money for Bobby was to be at sunrise, and yet the shadows and light clearly show the scene was shot around the noon hour.
In the final shootout scene, Bobby has less of a five-o-clock shadow than he did the day before.
Cliff Barnes looks at Bobby's driver's license and hand-written note. The driver's license shows his date of birth as 11/1/66. Filmed in 1978, this would make Bobby 12 years old. Also, the expiration is listed as 1/66.
When the kidnappers arrive to meet with Cliff Barnes, it is easy to see the mountains of California in the background, nothing even close to that in Dallas.
During a slide show presentation, Al incorrectly identifies Lucy Ewing as J. R.'s granddaughter instead of his niece.
After the kidnappers are shot, Cliff accuses J.R. of trying to shoot him, saying "One less Barnes out of the way." He meant either "One less Barnes" or "One more Barnes out of the way," but the way he said it makes no sense.