When Al Sah-Him caught Nyssa on the rooftop, Al Sah-Him held the sword to Nyssa's left side of her neck, but when Nyssa and Laurel were talking in the next scene, the wound can be found on the right side of Nyssa's neck.
In the flashback, just after Oliver and Maseo exploded the truck containing the virus, the gun Maseo is holding moves from his right hand to his left hand and back to his right hand in between shots.
When Nyssa and Laurel first tell Felicity and Diggle that Oliver has been brainwashed to become Ra's al Ghul, Diggle calls Nyssa, "Felicity".
While detonating a large amount of explosive in the midst of the virus store in the truck will certainly destroy some of it, the heat of the explosion will aerosolize at least a portion of it, thus spreading it further. It is unknown if Maseo and Oliver took this into consideration before setting the detonator.