The top picture is a normal "U"... but coin 1 seems to look like a lowercase letter "u". The coin 2 seems to have printed over something else??? here's also another penny i found... something with the die? there are a couple of dots near lincoln and also on him.
The second coin* seems to be an issue with the striking process while the third coin is definately a copper plating issue. Edited for some silly grammer error
The top coin appears to show post-strike damage. The bottom coin seems to show blistered plating. Of course, it has to be copper-plated zinc composition for this to be the case.
