In the climactic trapeze act near the end, Zach and Jeannie are repeatedly shown standing on the opposite side of the stationary platform in long shots from where they're standing in close-ups.
The human cannonball is shown climbing up the cannon, kneeling at the top, then swinging around and sliding into its mouth. In the next shot, showing the net in the foreground and the cannon behind, he's seen at the top of the cannon, swinging around and sliding into its mouth a second time.
While Red Buttons flirts around the shooting range, a small boy in a checked shirt behind him disappears and reappears between shots.
In the opening scene, just after Vincent Price announces the "parade of nations", there is thunderous applause as the camera is focused on part of the audience and the circus acts that enter the tent. no one in the audience is moving at all, let alone excitedly applauding.
When Zac Colino starts to walk the wire over Niagra Falls the first shot as he starts has him above the falls then he's shown part way over and part way below them.