This film clearly has problems with keeping things out of view (see other slip-ups). Towards the middle of film the doctor is opening the crate containing the dead cameraman flown back from Venezuela. As he is standing by the crate, watch the lower left hand corner of the screen. You will see two or three large spider's legs on a stick appear and be placed on the top edge of the crate by an unseen hand. (the stick can be seen through a hole in the crate). When the doctor walks away, the camera pans down to the side of the crate and the legs are made to disappear as if the spider is walking out of the crate and down the side.