In addition what has been already said above, you have to consider, that on both main variants of the the 727, the front cabin had the similar layout as the 707/720 with a larger, three person flight-deck, more stowage space for electronic equipment, and the front lavatory opposite 1L. There was no lavatory between the flight-deck and 1L like you would find on a 737 or 757.
The 727-100 had two different window versions: Most had two windows between 1R and the first overwing exit, because there was a galley unit on both sides of 1R. The high density configuration, e.g. for Japanese carriers, had three windows, because there was only on galley unit in front of 1R.
Many airlines used to have a smaller or larger galley unit also opposite 1R on the left side.
On the 727-200, every thinkable layout of a galley could be found in the rear of the cabin. E.g. on a 727-200 of Air France, there was no galley at all in the rear, there were only two rows of six abreast seats between 2L/2R and the two lavatories in the very rear of the cabin.
Other airlines had the galley only between the mentioned two lavatories and one of the two rear service doors, or both service doors, e.g. Air Canada or Royal Air Maroc.
The most used configuration was to have the galley on the left - most common - or on the right, e.g. Western. It usually had the space of four rows of seats, two between the aft lavatory and 2L or right, and two rows between the mentioned doors and the overwing exits.
Lufthansa had for some time a configuration with the two rows of seats between the lavatories and 2L/R, and a galley unit between the two service doors and the main cabin.
The layout of the front galley was a little less creative, because there was always a galley unit between the mentioned front lavatory and 1R. Most airlines had a second galley unit after 1R and the cabin, usually having a couple of seat rows on the left side. Some had a small galley unit also right at 1L, and some had used the entire space on the left side as a galley up to a bulkhead opposite 1R, usually without the mentioned unit after 1R.
And not to forget to mention the modification of Dan Air's 727-100s, which had the service doors 2L/R of the 727-200 right in front of the engines, just to have engough emergency exits for the British high density charter configuration...
My favourite planes flown: Lockheed 188 Electra, Tridents, VC-10, B-707, L-1011, A330, E90 + Concorde