When Mr. Waverly's car is going up the road it is a 1953 Cadillac, but after the rock slide stops the car, the silhouette of Mr. Waverly is in a Chrysler Imperial. When Mr. Waverly exits the car it is again the Cadillac.
The position that Nico is in after he is knocked out changes on the close-up shots.
At about 40 minutes, when the rock slide hits the brick wall, a portion of the wall separates and what appears to be a painted front panel comes loose from the separated portion.