When Jaime/Blue Beetle is fighting back against Black Beetle's attempt to destroy his Scarab, Black Beetle's mouth is wide open (only upper teeth showing) during the pulled-out shot where the blue light (Jaime and Blue Scarab's united resistance) is pushing back against the purple/"black" light (Black Beetle's attack), but in the next shot that is a close-up of Black Beetle's face, his mouth first shows gritted teeth, then opens.
When the 21st Reach device is detected at the North Magnetic Pole, it's stated that there are no zeta platforms close enough for anyone to get there in time. However, both Flash and Impulse are on the Earth's surface, and are quick enough to get there. When they can't use the "egg" to disable the device, they begin running around it to try deactivating it. They're not quite enough, so Kid Flash zetas to Earth and runs to help. However, it was shown in "Coldhearted" (1:20) that Kid Flash can only run at about Mach 1. He'd still be hours away from the North Magnetic Pole from any city that would have a zeta platform.