Visible crew/equipment: When Edmund returns to his house and complains about the smell as he enters, the edge of the set is visible on the extreme right of the picture, just before the camera zooms in on him.
Factual error: In the barn, the unknown, wounded knight offers ten thousand sovereigns. At that moment, on the floor, he lifts his arms. A small sticker is visible on the inside of his left shoulder plate. (No doubt a label that wasn't expected to ever become visible.)
Answer: The closest we ever get to knowing his first name is in series 3, when he claims it's "Sod Off". Blackadder asks him in series 3 where this came from, and he replies "Well, when I was a kid, living in the gutter, I'd go up to the other kids and say 'Hello, I'm Baldrick'. And they'd say, 'Yes, we know. Sod off, Baldrick.'" The S in this series is likely a reference to that, but it's not addressed, and given this Baldrick is clearly different from the series 3 Baldrick, we can't draw a direct link.
Shay