I don't usually make plot outlines: I have an idea of where a story will start and where it will end, with ideas for some of the plot points that may get visited on the way and then I just write. As I go along, I may make notes in an old diary as to when events I've written happen so the characters can refer back to them in the correct context, but that's all.
This time, though, the story and a lot of the key scenes have been in my head for so long that this morning I made a spreadsheet of the main scenes I need to write, to go with the spreadsheet I made to keep the backstory events in their correct sequence. So far I just have two columns: the main event of the scene and the clue that this leads to. I may add columns for specific dates and times later.
It remains to be seen, of course, which method works best for me in other projects.
How about you?
Writers, do you outline? If so, how?
Readers, how forgiving are you of writers who slip up as to when events in a story happen in relation to each other?