Thank you all for your help. I think together we can clear this up a bit...
I made a mistake, I have 28 Country flags, not 29. Daryl, the image you show from smurfscorner.tk is the very same set of 28 Country flags I have, plus the "JO (heart) CDC" flag is in that display too.
It's my understanding that the 4 flags with text ("JO (heart) CDC," "JO (frankfurter) LA LOAPA," "CONVERGENCIA I UNIO Molts i ben avinguts.," and "SOM UNA NACIO" are (and I quote a dealer, from April 2004):
"convention party flags from the catalunya party, like the republikan party in the states. They are very strong at the area from Barcelona (65-80%). They are a political party and they very national and more for their region (Catalunya) than for spain. On the flags, they show their opinion about new laws from the spain government"
They are shown at Steven Parkes' site:
http://www.nationalfriends.co.uk/promos.htm
Re: my extra flags, the one with the blue triangle is indeed Czech Republic. (Also shown at Steven's - who ID's 26 flags, a big help!) but the other is still a mystery. Fram guessed Argentina, but that flag has a sun in the center. I have Argentina too, but the mystery flag is just a blue-white-blue triband, with nothing else. Steven does show it, but calls it El Salvador. I don't think that's right; El Salvador also has a little something in the center.
So Steven shows 26 Country Flags on his page. I know of 2 more flags. He is missing a green-white-green triband, and another flag with 9 alternating horizontal stripes; 5 yellow and 4 red. I don't know what Countries they are.
I have another dealer offering me a 28 flag set, but he is missing the same two flags I am missing in many sets; the Czech Republic and the mystery blue-white-blue triband. Instead, this dealer's set includes "JO (heart) CDC" (the convention sign) and the regular black/white sign that came with the WG version of the signholder Super Smurf - a white sign with a border of clubs (different from the HK versions signs).
I also have three promo signbearer Smurf-a-grams, and I think maybe some of their flags got mixed in with my world soccer set. There is a green gram reading "Recuerdo de ANDALUCIA" holding the Andalucia flag (green-white-green triband), a red gram reading "EUSKADI zuretzat" holding what Steven calls a Basque flag, but if you search google for "euskadi flag" you find much the same flag (red field with white cross and green "x"). And there is a yellow gram reading "D'una estada a CATALUNYA" holding a Catalunya flag (4 red stripes alternate with 5 yellow stripes).
Oh, I'm just so confused. It seems as if dofferent sets of flags have been passed as the same World Cup flag set. I guess Steven's list of Countries should reveal what the real set should be.
I don't think the 4 convention flags belong with the soccer world flags, but they were distributed at the same time in the same country. One of them; "JO (heart) CDC" I received one of with each flag set, so maybe it was distributed with both the flag set, and the convention set?
XoioX2000, what does your odd flag look like?
Steven, where did you find a list of the Countries in the 1982 soccer world cup?