The most common mistake I make is to switch to (for example) aperture priority for a particular subject and forget to switch back to program/shutter priority/manual as needed for the next subject. I'll usually twig what I've done if the light changes and the readings don't move as I expect them to but not always.
Sometimes leave the exposure compensation dialled in to a particular figure and forget to move it back after I've finished with the subject that needed it.
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