It's perception bias. It happens a lot on here. There are a lot of mistakes in a hockey game. Its a fast-paced, back and forth environment. When you expect a player to make mistakes and you are looking for them, you are going to find them. That in turn that is going to reinforce the original perception. When you see things that are not expected, you discount those and forget them.
Its why I believe advanced stats are so important to a good discussion. Perception bias is a huge flaw of the eye-test. Stats are more objective measurement. They are not perfect, either. But when you couple both, they can help overcome the weakness of the other.
