I also remember if you had 1 belt side loading onto another belt, and the item frequency lined up just right, items on the main belt could catch those on coming

I also remember if you had 1 belt side loading onto another belt, and the item frequency lined up just right, items on the main belt could catch those on coming in from the side belt and push them along. This resulted in items hanging off of the side of the belt, still making their way through the factory.