In Ragna Rok, Hellboy's left eye is empty all the way up to the end...
But then, the last time we saw him, his eye is yellow! (Caption: "Okay then.")
Was this intention, or is it a mistake to color the empty eye yellow?
... Or did he take Hecates eye? Since the iron maiden left eye is bleeding? .(but the sequencing says its Hellboys blood)
So many questions