Revealing mistake: When the monster uses its claw to swat Hayata away, under the superimposed claw you can see the abrupt disappearance of Hayata's shadow from one frame to the next. (00:19:30)
Continuity mistake: Hayata blindly reaches for the Beta capsule that allows him to become Ultraman. He accidentally knocks it off the building. It happens twice in two separate shots and it happens differently, with either end falling first. (00:20:15)
Revealing mistake: When the monster is revealed behind a column as the troops enter the building and it splits in two mirror images, they did not stop the clock in the background, which reveals whenever they stopped filming to change things in frame.
Other mistake: At the beginning of the episode it is said that the events take place 38 hours apart. It's 2:25 PM. We see then Arashi get up in the middle of the night, so it could easily be midnight...but then he reaches the station and it's daylight, and the kid is in his car, even. Moreover, when the troops enter, a clock inside the building points 2:10.
Revealing mistake: The victims of the stasis ray in the episode try to hold still as much as possible...with varying° of success.
Revealing mistake: When Ultraman finally confronts the fake Ultraman (Zarab), one of the shots shows the two Ultramans rotating around, followed by a right-hand punch right to the fake's left neck. At the end of the shot, the suit actor can be seen wagging his right arm in mid-air, possibly hitting the neck too hard. What's even noticeable is that parts of the silver paint on the right glove fall off. (00:23:34)
