Bradford enters the ship at the end and is caught in the explosion but soon after when Martin enters the ship and goes to the same equipment there is no sign of any damage.
The opening footage of the alien spaceship in no way matches the on-screen prop used when the police investigate the landing site.
The musician attacks the monster with his guitar and smashes the instrument, dropping it before being killed. When the police arrive later the guitar has jumped about 20 feet over to some blankets.
When Martin's vehicle comes in to crush the monster, it is 10-15 feet away from the army truck but when Martin rams the monster it is right up against the truck.
After the monster eats everyone in the corner of the dance hall it turns and a man is seen standing at the bar and the center aisle is empty.In the next shot the man at the bar is gone and there is a couple standing in the aisle.
The Colonel's field helmet looks like either a badly painted star (which makes him a Brigadier General) or a badly painted eagle. Either case, it does not follow military esprit d'corps to have something painted.
The truck the soldiers travel in has U.S. Army painted on the driver's side only. All army vehicles have a star painted on them and have "U.S. Army" on both doors. Also the truck has a civilian license plate.
As the soldiers attack the monster, the pistol shown being fired in close-up is a Smith and Wesson Model 39, which was only ever used by U.S. Army test and marksmanship units - never by combat troops.
The filmmakers only paid cursory attention to normal Army protocol and chain of command. Although the unit apparently includes several sergeants, Col. Caldwell is seen driving the truck and personally ordering the enlisted men to move the fallen tree; under normal circumstances, a senior commissioned officer (a colonel) would always ride as a passenger while an enlisted man drives, and a sergeant would give orders to the lower-ranking personnel.
Shortly after the monster arrives at the dance hall, a woman running towards a door is thrown down by a man who grabs her arm. Her dress and brassiere are torn away, briefly revealing her breasts. The woman looks surprised, covers her chest and hides behind a man for the remainder of the shot.
Feet are visible underneath the monster costume.
The monster's first victim is clearly climbing into the creature's mouth.
The instrumentation inside the alien spacecraft has English and Earth style lettering and numbering. Careful observation also reveals some Earth corporate names and/or trademarks on some of the panels.
When the grenade explodes, it's readily evident that there is no actual explosive shock wave, and that the dust landing on the monster and the characters is being thrown by a stagehand immediately off-screen.
Almost all of the dialogue in the film is poorly looped, with lip movements seldom coming remotely close to the actual words being spoken.
Before Betty the housewife starts to hang up the laundry, she shuts the door with her foot. We hear it slam close right before it visually closes.
In the dance hall the you can hear at least two horns in the music but there is only a one saxophone player in the band.
As the soldiers attack the monster, only sporadic gunshot sounds are heard, and the sounds don't match the recoil motions made by the actors.
After Betty the housewife dies and we cut to a shoot of her laundry, you can see cigarette smoke blowing in from camera-right as the cameraman puffs away.
When the creature is shot by the military, you can see the big rope they have attached to it that the crew yanks on to make it look like impacts.
When the monster flips over the car for a second time, a crewmember's hand is visible in the upper right part of the frame helping to push the car over.
In one scene where Martin is talking to the colonel in his office the shadow of the cameraman is seen on the wall behind Martin.
The alien spaceship controls are marked in English and have human-hand type controls, despite the fact that alien is a 10 foot-tall bacteria culture.