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

1. Add a circle larger than the cylinder near the top of the object. This circle should be noticeably larger than the diameter of the cylindrical body to meet the requirement.

2. The circle at the top of the cylinder needs to be extruded. This means it should not just be a flat end cap, but should have some three-dimensional shape or extension beyond the surface plane of the cylinder.