Based on the answers provided, the following corrections need to be made to the 3D object:

1. The overall shape of the object needs to be modified to resemble a trapezoid. This means it should have a pair of parallel sides and two non-parallel sides.

2. A trapezoidal hole needs to be added to the object. The hole should be designed in such a way that it maintains the overall trapezoidal shape of the object.

3. The size of the trapezoidal hole should be smaller than the size of the original trapezoid. This will ensure that the object maintains its overall trapezoidal shape while having a smaller trapezoidal hole within it. 

Please note that the object should continue to be extruded in one dimension as this aspect of the design is correct.