Easy mistake to make, especially when you've changed a few receptacles and then encounter one of these.

You need to break off the receptacle tabs on outlets 2, 3, 4 and 5. And done.

Note that it's possible to make a key mistake with 3-way switches; I don't think you did. You seem to know the importance of the black screw, and that's the gist.

Now, you mentioned that you only want receptacles 4 and 5 switched. It is possible to avoid splitting receptacles 2 and 3, but it opens two big cans of worms.

First, the next homeowner may want it different, so having receptacles 2 and 3 unswitched hurts a potential selling point.

Second, this requires "touching" (having to alter, and thus be responsible for the workmanship of) the splices in the back of the box. I really, really, really do not like what I see: a huge clump of electrical tape with 2 wires exiting 1 side and 1 wire exiting the other, especially when that clump is not wide enough to plausibly contain a wire-nut.

So I don't want to touch it with a 10 foot pole, because I don't want to be responsible for it. Different deal for you though; it's your house that burns down. The metal boxes do help a bit. Though I would be happier to see you either install AFCI breakers...

... or scourge these horrible splices from the house. I would carefully unwind the electrical tape, NOT cut the tape for fear of nicking a wire), and NOT cut the wires because you need the length (though of course pigtails are expendable). Then bind it with a proper, quality wire-nut (Ideal brand, not GB: yellow for 2-3, red for 3-6) using good technique, tested by a firm pull test.

Never taped. Taping wire nuts is done because the wires pull out if you don't tape them. But if the wires pull out, the connection is bad and will arc, and we'll be right back to square one. So, iterate on technique until you pass the pull test everytime. The only time to tape wire nuts is when capping off a single wire; nuts aren't intended for single wires and they need some help.

Back to unswitching receptacles 2 and 3. Once you have finished fixing the splices, you install 2 and 3 with the tab intact, and cap off the red pigtail, or just don't install it.

If you already split the tab, then keep the red pigtail and join it with the black pigtail on the black-wire wire nut.

Easy mistake to make, especially when you've changed a few receptacles and then encounter one of these.

You need to break off the receptacle tabs on outlets 2, 3, 4 and 5. And done.

Note that it's possible to make a key mistake with 3-way switches; I don't think you did. You seem to know the importance of the black screw, and that's the gist.

Now, you mentioned that you only want receptacles 4 and 5 switched. It is possible to avoid splitting receptacles 2 and 3, but it opens two big cans of worms.

First, the next homeowner may want it different, so having receptacles 2 and 3 unswitched hurts a potential selling point.

Second, this requires "touching" (having to alter, and thus be responsible for the workmanship of) the splices in the back of the box. I really, really, really do not like what I see: a huge clump of electrical tape with 2 wires exiting 1 side and 1 wire exiting the other, especially when that clump is not wide enough to plausibly contain a wire-nut.

So I don't want to touch it with a 10 foot pole, because I don't want to be responsible for it. Different deal for you though; it's your house that burns down. The metal boxes do help a bit. Though I would be happier to see you either install AFCI breakers...

... or scourge these horrible splices from the house. I would carefully unwind the electrical tape, NOT cut the tape (for fear of nicking a wire), and NOT cut the wires because you need the length (though of course pigtails are expendable). Then bind it with a proper, quality, newly made wire-nut (Ideal brand: yellow for 2-3 wires, red for 3-6) using good technique, tested by a firm pull test.

Never taped. Taping wire nuts is done because the wires pull out if they don't tape them. But if the wires could possibly pull out, that means the connection is bad right now, and will arc and start a fire! So, iterate on technique until you pass the pull test everytime. The only time to tape wire nuts is when capping off a single wire; nuts aren't intended for single wires and they need some help.

Back to unswitching receptacles 2 and 3. Once you have finished fixing the splices, you install 2 and 3 with the tab intact, and cap off the red pigtail, or just don't install it.

If you already split the tab, then keep the red pigtail and join it with the black pigtail on the black-wire wire nut.