It is unknown how Kuroto obtained the Bugvisor, as Gai had to supply him with his Gamer Driver and Gashat.
When Kuroto was punching Gai, Rin was shown standing behind both of them. In the next shot she disappears, but reappears in the following shot in a different placement.
Gai throws Dan into a pillar, destroying it. However, it remains intact in the next shot.
Kuroto is holding the Genm Musou Gashat with his fingers when he summons it. However when he flips it upright, there is a shot of him holding it entirely by the hand when he flips the nozzle.