Seriously, complaining about a small bone fragment in a chicken dish? The only time that complaint would have any grounds would be if the dish wasn't supposed to have chicken in it, period (e.g. vegetarian).
"Boneless" chicken will sometimes have bone fragments. Fish fillets will sometimes have bones also. "Pitted" olives sometimes have pit fragments. Crab cakes will sometimes have shell fragments. Hell, isn't there a wild boar dish that BA serves periodically that carries the warning "due to the nature of the product, this dish may contain shot pellets"???? You can't possibly think that a small chicken bone in a chicken dish is worth a complaint, much less compensation?
The taped up window is a little ghastly looking. If you weren't informed of it prior to boarding and offered an alternate window seat, then that would be worth a few thousand Avios IMO.