Chapter 15: Prior to climbing the mountain, the sheriff grabs a Tommy gun and is carrying it. Ongoing shots he slings it over his shoulder, then carrying it, then it is slung over his shoulder again.
Driving through a haystack shouldn't cause it to burst into flames.
The cockpit on Tobor's special jet plane never closes completely all the way when it's flown.
A few of the chapter cliffhangers are no peril to the heroes. Sometimes it's the bad guys that are in trouble. Which doesn't make much sense as being a cliffhanger.