[FarmerPotato]

Yeah 1) is a very old technique. I forget whether the texture makes the part release more easily, or not. 2) This is what they look like now (90s or later) https://img.brickowl.com/files/image_cache/larger/lego-red-b... 3) I see on 2877 that the runner is on a top stud, just like other bricks. I don't know where I'd put the mold parting line, but I think it's usually in the plane of the brick. Stunning how Lego parts never have flash!