i believe most flags in the playmobil world r made up in the sense that they represent a certain style that can be attributed to certain countries, for example the harbour guards r of a certain british style as are the colours of the flag.
the fleur-de-lis has always been a symbol of france and the "blue coats" in combination with that flag seem to confirm that theory.
both flags however have - at least to my knowledge - no exact historical reference.
as opposed to this, at least one early medieval crest is infact historical accurate.
interestingly enough the western sets all display the correct "stars and stripes", even the old cavalry uses a design which was used by the us cavalry.
also the "stadtwache" (townguard) sets all display the crest of
nuremberg (nürnberg), which is the biggest town in the vicinity where playmobil is produced in germany.
my 2 pennies worth...