You’re right. The light flashes in the top of the Washington monument are out of the ordinary. different patterns. more like dots and dashes
The camera is on a jittering loop. they are feeding the loop poorly.
Watch the front of the entrance, watch for the guy in black, he will repeat his movements about 3 minutes apart or less.
Confirmed aircraft went from horrizon towards right of camera.
What you are seeing is a looped time streamed fake