regarding qty callouts on balloons, the last place I worked had some very busy assy dwgs and every item that was a qty of 1 had a 1X next to the balloon.
just signed up today. seems like a neat forum. retired last march after 46 years in the business
(25 years as a checker)and enjoy reading and maybe helping out.
if you add a new sheet to the drawing a lot of companies put "this sheet added" as well as the latest rev letter. there are many variables on this. the old rev status block on sheet one is a real mind blower.