CANADA
This section is always being expanded, I am interested in hearing any information not yet seen here about Jem in other countries, from either if the cartoon was aired there, to what products were available.  Feel free to contact me with any of this information!
CANADA- "Vraiment Extravagante"
The Show:  Jem was aired here from beginning to finish, and then in repeats up until around 1990.  (this varies by region I guess).  We also got the Super Saturday 7 minute clips (thanks Lisa for the confirmation on this!)
Hasbro's Toyline: The easiest way to tell a Canadian box is there will be a Canadian address (Longueil, Quebec) on the back. The tagline on the doll boxes is "Truly Outrageous/Vraiment Extravagante". Canada had everything the US had.  The only difference I've been able to see is that we had a few differences on the MTV offer (we got an offer for some other stuff not in the US).  I haven't seen all the posters yet, but my second year catalogue poster was double sided, French on one side, English on the other.  I also have a Canadian first year illustrated poster that is for the most part the same as the US First year Jem illustrated poster, the differences being the TM marking, the "Truly Outrageous" is removed and "Truly Outrageous/Vraiment Extravagante" is replaced in a different font, and the bottom right corner says 1986 Hasbro Canada Inc. on it.

The French text on Canadian boxes differs from the French on the European French boxes, here are some examples:
 
English Name French (Canadian) French (European)
Rock & Curl Jem Rock & Curl Jem Jem Rock N' Roll
Flash N' Sizzle Jem/Jerrica Flash N' Sizzle Jem/Jerrica Jem Rock N' Flash
Video Vidéo Vidéo
The Starlight Girls Les Filles Starlight Les Starlights
On Stage Fashions Mode Étoile Les Tenues De Scene
Smashin' Fashions Mode Smash La Mode Misfits
Flipside Fashions Mode Flip Les Deux Modes De Jem
Music Is Magic Fashions Mode Music is Magic Mode Rock Music
Glitter N' Gold Rio Glitter N' Gold Rio Rio Rock 'N Gold
Glitter N' Gold Jem Glitter N' Gold Jem Jem Rock 'N Gold
Glitter N' Gold Roadster Glitter N' Gold Roadster Coupe Rock N' Gold
Video Madness Playsets Ensembles Vidéo Folie Video Set
KJEM KJEM Guitare Rock Studio Rock Guitar
New Wave Waterbed Lit d'eau Nouvelle-Vague Le Waterbed, Nouvelle Vague
Glitter N' Gold Fashions Mode Glitter & Gold Mode Rock N' Gold
Star Stage Scène Étoile La Scene Rock
Rock Backstager Coulisse Rock La Loge Rock
Wrist Rocks Tic-Tac Rock Jem Watch

Other Jem Items:
Lunchbox and Thermos with Hologram decal on front.  (Canada only) ;  Box is large domed "Canadian" format, pink.  Decal shows holograms in their first year poses, Glitter and Gold Jem and  the Rockin' roadster, palm trees, lights and triangular graphics make up the background.
28 g. Mini Soap, G.T. Fulford Co. Limited.  (Canadian) (1987 Licenced by Hasbro) 
Glitter N' Gold Jem Full wrapper
Flash N' Sizzle Jem (misnamed "Glitter And Gold" on package)
Glitter N' Gold Rio
Panini sticker album, These were also available in many other non- US countries in different languages.   Came with a poster to attach foil stickers to.
*All soap scans (except first Glitter N' Gold Jem Soap)  from A. Tremblay.