Also true! Most common when you accidentally screw up a footprint and it doesn't fit the part on the BOM. A backwards part is the kind of thing they're not like

Also true! Most common when you accidentally screw up a footprint and it doesn't fit the part on the BOM. A backwards part is the kind of thing they're not likely to pick up on (if it's marked on the silkscreen incorrectly, at least), but some do.