Plot hole: Coco asks Illya if he knew she was going to be kidnapped, and he says "At that point, I didn't even know you existed." Strange answer. He and Solo met her outside the observatory several minutes before the kidnapping, so he did know she existed.
Continuity mistake: Illya's shoe converts to an improbable electric drill. He inserts a foot-long drill bit (and just where was he hiding that when the baddies searched him?) into the flat of the heel. But when he starts drilling at the bars, the bit is sticking out of the side of the shoe instead.