After the bullet hits the lamp in Mannix's office the shade breaks, the lamp goes out but the bulb is intact. But when Lt. Malcolm arrives the bulb is broken.
A helicopter lands, and the rotors stop moving. In the next shot, shot from the air, the rotors are moving again. The next shot is again from the ground and the rotors have stopped moving again.
When a bullet hits a lamp in Mannix's office, the lamp goes out even though both bulb and fixture are intact; the only damage the lamp takes is to the lampshade.
When Mannix works on modifying the child's toy gun under the table, the hands in the close-up are not Mike Connors'. They have no hair on the backs, whereas his are very hairy.
Shortly after Mannix removes his hand from the child's mouth, he hides from the bad guy with his back against the wall, but his gun is carelessly pointed directly at the child.