Fixing my mistake in slipped stitch colour work

I've been working on my knitting for years and have become quite good at following patterns and creating some original works. But the true test of my skills came at me this morning.

This is what happens when you just want to get the project done and are busy knitting late into the night. As you can see there are several rows of knitting after the mistake, but it took me until later this morning to realize what had happened.

John tried to convince me that this was just character for the project, but I knew it would drive me crazy. The only way forward was to go back and fix it. Since it was only two stitches involved, I decided to drop stitches one at a time to fix this.

I ripped the first stitch and thought I fixed it right, so I looked at doing the second stitch.

Can you see the issue here? I didn't. Not until I got the second stitch fixed. See that bar on the green? I didn't fix the purl right. So back down I went. 

That looks right now doesn't it? Nope. Four blue stitches over the area fixed, before going to 2 green stitches, but the next location has five stitches.

Looking at the back. There's no slipping on blue!

Back down we go. This was getting ridiculous, but I had to fix it right. 

So let's count, five blue stitches, two green, one blue. Finally! 

And now it is right, right? Last check on the back. Yup, it's good.

Can barely spot the fix, and blocking will make it disappear.

So what is the lesson here? Always look on both sides to make sure the fix is right. And don't take more than one stitch out at a time, if you can avoid it.