Sometime I found that I input the typo tag (eg. model name) after a large number of post.
So I need to edit the post single-by-single.

each.. after editing too much post, the Captcha appeared.

This too annoy and cause to take a lot of time in editing.

There are the easy way to edit?

if it is the same type over and over again i would put the wrong-tag and right tag in the "my tags" menu where you can remove and add the correct one very quickly