Based on the answers provided, here are the corrections needed for the 3D object:

1. The object needs to be reshaped to resemble a pentagon. Currently, it is made up of a rectangular prism and a triangular prism which do not form a pentagon.

2. The connection between the isosceles triangle and the top of the rectangle needs to be made clear. If they are not connected, they should be.

3. The bottom two corners of the object need to be cut out to resemble small triangles. Currently, the rectangular component has intact corners. 

Please make these changes to ensure the object meets all the required criteria.