The Caravelle indeed had more or less triangular windows. Albeit with rounded up corners. The plane had been designed soon after the Comet, the first version of which would crash mysteriously, with the fuselage breaking in two after a very predictable number of cycles. Eventually, after it was pulled form service and after water tank testing, it was found that fatigue due to stress concentration in the corners of its very square windows had been the culprit.

However the Caravelle did not really have a T-shaped tail. Rather, the horizontal stabilizer was more or less half-height. I would say (from memory) somewhat below half. Also, the vertical stabilizer did not have the shape that we are now familiar with, but instead, was rather round, more like in the previous generation of piston engined planes.

Might be that its cruise speed would have been lower than newer jets?

As to noise, I don't recall that it made noises particularly different than other planes of that time. Strangest noise that I can remember were on BAE146. I also remember some 320 in which a hydraulic pump sounded real funny.

But coming back to the Caravelle, it had funny airbrakes. Board with holes, which would come up on top of the wings. And at low speeds it would seem to crawl. I still remember an approach in Marseille, probably coming in from either Constantine or Annaba (in Algeria anyway), fly quite low over roofs at low speed; felt like it was barely hanging there.

Some were still flying in Brazil in the seventies, operated by an airline that was eventually bought by RG, called Cruzeiro do Sul (Southern cross). One of which crashed somewhere in northern Brazil; a colleague of mine had been booked on that flight but cancelled at the last minute. I believe their last one was destroyed on landing in Manaus, with no casualties. Months or perhaps years later, the burnt carcass was still lying there.