Continuity mistake: Throughout the entire movie, the irregularly-sized characters are constantly changing size when compared to one-another. Except for Barky (even Junior, he is awfully big for a baby) I.E. when Bastian accidentally steps on the gnomes' house, the gnomes are the height of Bastian's shoe, yet when they run out of the house, they are as tall as his leg up to his knee cap.
Continuity mistake: Despite making the jump with Eddie from one building to the next, the two goons come out of the original building they jumped away from. (00:27:00 - 00:28:20)
Continuity mistake: When Abobo and Hawk are chasing Billy and Jimmy in the car, Billy throws a can of stuff in the fuel feed of the car. This causes a super combustion that propels the car towards the concrete railings of a bridge. Shots of the exterior show a different type of wall beside them. The car blasts forward and there is a tunnel a few yards in front of them. Switch to interior again and it shows bridge railings with no sign of the tunnel with prolonged speed towards same direction.
Continuity mistake: In the scene where the wagon train is waiting for Wagonmaster Harlow to decide which fork in the road to take, all the shadows are to the left. As they approach Harlow, the shadows are in front and moment later when the wagons move off the shadows are to the right. (00:26:20)