Also, I do not believe the official Peru and Bolivian flags have a coat of arms, just the bands of colors.
Nicaragua and El Salvador look similar, but if you zoom in on one of them, you'll find that Nicaragua's says "republic of Nicaragua on it."
Paraguay also has its name on its flag.
I always remember St Vincent and the Grenadines because the diamonds on the flag are shaped like a "V"
Ditto to the stars on Honduras' flag; they look like an "H"
(I found more, but they will probably just work for me so I wont tell them, like trinidad&tobago and st kitts and nevis are both divided into two's and both have two names. (and kitts and nevis has the stars)