The leading edges sometimes don't lead. Parts of the electrical system, including the generator control units, sometimes don't control. Relays don't relay. These aging systems require that you pay close attention to maintenance, and learn the idiosyncrasies. The cockpit of this airliner has to be one of the noisiest, especially if you fly fast, which most operators do.
Most pilots wear earplugs.
On The venerable 727 is the DC-3 of the jet age. Those are big wheel wells to fill, and I don't say that lightly. It's also one of the last of the real pilot's airplanes, before they became easier to fly with artificial software feel, multi-magic buttons, flight management systems, and digital integrated computer suites. Yeah, I'm going to miss this old cranky bitch. So long, old friend.