For Portal Reloaded players, this is a guide that contains all the easter eggs I have found so far, if you are looking for them, this guide will help you out.
Chapter 5

Place the time portal anywhere

walk through an keep walking

use mouse wheel zoom to look here

There he is!

You should see him waving right before he is deconstructed and rebuild elswhere.
Chapter 23
After completing Chapter 23, run along the walkway and look to your right.

Here you will see a green light, along with P-Body running towards it.

If you can’t find him, use noclip after Chapter 23. He doesn’t despawn.

That’s all we are sharing today in Portal Reloaded Easter Egg Guide, if you have anything to add, please feel free to leave a comment below, and we’ll see you soon.
Credit to Pugstonhale and MysteryPancake