There are two significant practices that you should avoid. The first is known as Z-clipping. Primarily, this can happen if two bolts are close to each other. What happens is you can grab the rope from below the previous one and not from above it. Thankfully, the rope drag created from this will not allow you to go very far, typically, and you can resolve the issue.
The other issue is known as back clipping. In short, this happens if you clip the rope in a manner that allows it to travel from the outside into the rock. It should be from the side of the cliff to the outside. What can happen if you screw this up is the carabiner gate can open due to the rope and cause the cord to unclip.