Not all 767-300s have 2 overwing exits on each side. Some have 2 normal doors on each side forward of the wing and 2 aft.

767-400 has raked wing tip
747-100/200 short upper deck with 3 windows on each side
747-SP short 747
747-300 stretched upper deck but no winglets
747-400 same as -300 but with winglets
777-300 LONG - longer than a 747
777s all have a "flat" tail that looks like the end of a flat-head screwdriver and not a conincal end

A-300/310/330 - fuselage is less symetrically conical at the rear end than a 767.


717 (MD-95) - what appear to be big short engines similar to a CFM56 on a 737

DC-10 - straight above-fuselage tail-mounted engine
MD-11 - same as above but longer and with winglets on main wing

Beware of a Trident as it can look like a 727, not that you'll likely see any Tridents.