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

1. Add two more circular holes to the cylinder. The current design only has one hole, but it should have three in total.
2. Position the two new holes near the bottom of the cylinder. The existing hole is already correctly positioned near the top.
3. Ensure that the diameter of all three holes is slightly smaller than the diameter of the cylinder. This detail was unclear in the current design.