Keep in mind that the Mexicana plane that crashed due to an exploding tire had been seviced with air instead of nitrogen.
The horizontal tail has three degrees anhedral. It is interesting to note that none the tail has provision for anti-icing at all. The wings do on the entire leading edge except for the one Krueger flap on each side that has the landing light in it. The forward part of the very inboard top of the wing is anti-iced as well, I would assume to provide extra protection for engines 1 and 3. The VHF antenna on the roof also receives bleed air for protection of the #2 engine.
One thing I have found odd as a passenger on the 727 sitting at the far aft of the plane with a window seat where you are right beside the engine inlet, is that when thrust is applied for takeoff, you see a condensation trail that looks like a rope coming from the area between the engine and the fuselage going forward and curving 180° and going into the engine intake. Have seen it a bit on the MD-80 as well.