Details of the First Hit

All right, so maybe the strange shadows that appear on the face of the WTC (in particular see frames 56 and 57) are simply from the complex play of sunlight on the wings and body of the plane as it approaches and enters the tower.

But what accounts for the odd pimple that appears to the left of where the left wingtip hits?

Moreover, does the plane ever entirely go in the building, or does the tail turn into a explosive cloud?

What a striking difference between the first and second hits-- where with the first hit, an explosion forms immediately at the site of impact whereas with the second hit, the explosion comes out the other side of the building first. Granted, part of this difference is that the first plane is hitting the core dead-on, whereas the second plane avoids the core. However, the second plane STILL rams into multiple concrete and steel floor slabs at a perpendicular angle, and these should present a significant obstacle.

UPDATE: there is also a suspicious explosive "pimple" that develops on the right side of the plane-- see frames 73 and 74 here. The reason these "pimples" are suspicious is because they devleop at the ends of the wings, away from where the explosion should be. These pimples are sort of like independent explosions, almost as if someone was trying to enlarge the hole the plane's wings made.