Chapter nine: In the fight with Laska's men, Blackhawk"s sleeve is torn under his left arm. Under the escaping gas, no torn sleeve. In chapter 10, you can get a better view of no torn sleeve.
Prof. Rolph explains to Blackhawk that his ray machine at full power will level an entire city, but when he is captive he tells Bork and Aller that his machine at full power will destroy an entire building. In Ch 5 the Prof explained to the thugs, Bork and Aller, that because the Target Disc was removed (by Blackhawk) it wasn't up to full power but "it can still destroy a building"
Prof. Rolph is explaining his ray machine and states that the beam travels faster than 3 times the speed of light, but it takes several seconds to destroy the chair. According to the people that know, nothing is faster than the speed of light.
Laska and her henchmen have several hideouts. Each one is a different building. But the inside of each are all alike. Same furnishings, same wall hangings, same size rooms, same exits, and same secret room. Blackhawk noted in both Ch 5 & 6 the inside is the same for all hideouts so prisoners won't know which one they are in.
When the train locomotive hit Blackhawk's car in Chapter 5, it shows some damage to the back fender of the car. In all of the rest of the chapters the damaged fender looks fine.
Throughout the entire series Blackhawk's airplane door changes. The inside of the door goes from having circular indents to just a plain flat surface. Inside scenes when flying show the flat door surface. When landed the door changes to the circular indents on the door.