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

1. The object needs to be reshaped to resemble a pentagon. Currently, it has a complex shape with multiple angles and sides that do not conform to a pentagonal structure. 

2. An isosceles triangle should be clearly connected to the top of the rectangle. Currently, it is unclear if there is an isosceles triangle directly connected to the rectangle's top.