In general I sometimes find it hard to decide to point out someone else's mistake, or forget about it. Here is a specific example. My manager called and asked why I was not at work. I told him I was unaware I was supposed to be. He said another manager left him a note saying that she called me yesterday at 3PM. I told him I don't have a recollection of such a call and it's not in my call history. Anyway, I just went to the shift as fast as possible.
We all make mistakes but I feel confident it wasn't my fault given it's not in my call history. I tried talking about it with the manager I was working with today and he basically said he didn't know what happened.
A second example is, the manager told me I did something wrong. I told him someone else told me to do it this way. Should I have said that, or just say "OK"?
In situations like this is it better to forget it or defend myself? Small aside, should I take a screen shot of my call history and send it to the manager, or would that be bad for privacy sharing my phone call history with them?