When Arte use the number 7 key to unlock the door the blinds at the top of both door are nearly all the way down to the curtains. Upon going inside the door the blinds are up the top of the window pane.
During the bar fight where West and Aguila are fighting the phony sailors, at one point Aguila (or the stuntman playing him) loses his cap (or whatever the headwear he has on is) - but then, after a cut, Aguila suddenly has his cap back on while fighting his opponent. Somehow, I don't think he would have taken the time to put his cap back on while he was in the middle of a fight of that nature.
When West puts on the underwater breathing helmet, Artie is shown bolting the helmet together using large wing-nuts. However, when West enters the underwater lair, the helmet is obviously already unbolted. There is no way that West would have unbolted the helmet while underwater, as it would have leaked in and he would have drowned. Also, the position of the bolts (just above the shoulders) makes it difficult for the wearer to unbolt the helmet quickly. In addition, when West takes the helmet off in the chamber, there is no waist belt attached, which West conspicuously tightened before diving.
At 42:04, Jim's left wrist is bound with a leather strap whose slit starts at the back and goes around to the front from the right. After Arte enters the room (at 43:33), his binds are shown again, but now the left wrist strap starts at the back and goes around to the front from the left.
It is stated the "new ironclad" USS Missouri is expected to arrive in San Francisco. During the Grant presidency, the U.S. Navy had no ship of that name.
After the 'missile' is launched, West is on the launch control platform, and escapes the bad guys by using a convenient rope to swing off the platform to the air-lock doorway. During the sequence shown through the air-lock door, West swings to a point above and to the right side of the door (from the viewer's point-of-view). However, when West drops down to escape, he comes from above and to the left side of the door - obviously a stuntman did the rope swing, and West dropped down from just above the door.
When the missile/mine is released, it bobs to the surface and begins moving toward the ship. The sequence shown is the same sequence as when West supposedly re-programs and it sinks below the surface to return back to the underwater lair - just shown in reverse.
It is human nature that when attacked by a large threat a person will try minimize their vulnerability by getting low, down, and therefore harder to hurt, kill. Yet when the kraken attacks Aguila, Aguila reaches up, stretches out, and thereby presenting himself as an easier target. Obviously, this prop was awkward and difficult to control. It is equally obvious that in order to facilitate his killing, Caruso (playing Aguila) was instructed to reach up and make it easier for the prop to be able to grab him and thereby "kill" him.
When the kraken attacks Jim and Aguila, Jim is knocked into the water. When this attack takes place, it is night, BUT once under water, instead of the water being dark, black, it is brightly lit (and bright blue at that!). Obviously, this scene was filmed at a tank of water and brightly lit for the convenience of the camera crew.
When Jim redirects the underwater missile back to the underwater facility, reflections of the water surface hit the bottom of the "ocean". But this would only be possible with light coming from above the water. As it is night, there can be NO light that could penetrate the depths of the ocean (moonlight would NOT be strong enough to do this), making it quite obvious that this is another scene filmed in a tank of water, with light shining down from above for the convenience of the camera crew.
The misleading as it is called is in reality an underwater bomb.
If Jim West obviously had to use the underwater diving helmet to get down into the underwater dome, then shouldn't he have to wear it to get back out and up to the surface? But when they are escaping and he jumps back into the water to catch the missile he does not put it on. And it was also out of oxygen.
During the kraken's attack on the U.S. Navy lieutenant, a wire helping to suspend a tentacle is clearly visible.
Artie measures the height of the air inlet for the bubble which appears to be about 10 inches high. He then converts that to real feet with a slide rule. But multiplying the scale by 10 (inches) shouldn't take a slide rule - just move the decimal point over one place. Slide rules, in fact, don't keep track of the decimal point; you would multiply by 1 and move the decimal point over one place.
When Jim tries on the underwater helmet, there is NO seal, NO gasket, around his chest to keep water from entering the helmet. Without such a seal, water would have entered the helmet and drowned Jim (thereby ending the episode and series!).
When Artie breaks into Bartlett's room, the first thing he does is light the lantern. Eventually, he finds the key hidden in the lantern glass by hearing it rattle around in the metal trim. Question: Why didn't the key rattle around in the lantern glass/trim while Artie was lighting the lantern at the beginning? He certainly moved it around enough then for it to rattle.
Toward the end when Daniel divulges his dastardly scheme to Jim, he orders his men to tie Jim up. His men advance on Jim and Jim submits. BUT when has Jim ever submitted to the bad guys? No matter the odds, Jim always resists to his utmost ability, at least up until now! Only a inconsistent screen writer could have created such an deviant character alteration in this hero.
At 42:00, Jim's hands are bound by looped leather straps around a metal pipe behind his back and he's shown struggling against them. But, as can be clearly seen on his left wrist, to undo them would simply be a matter of reaching over with the other hand and slipping the loop.