When Cannon in first involved in the chase with the box truck the position of the spoke of his car's steering wheel varies from 11:00 to 1:00, but as 1971 Fords used a 2-spoke wheel with the spokes at 8:00 and 4:00 this would've meant he was driving in a circle. The wheel is in a more normal position later in the chase sequence.
When the gunshot caused the gas explosion there were no flames coming from the leaking pipe. In fact the explosion occurred far from the pipe and instead from behind a box which was located behind the gas pipe.