*Wave 5 & 6 figures were initially released for a short time on red cards. Within weeks they were replaced by green cards with the new holofoil sticker design.
The collection numbers on the card fronts refer to specific assortments. One for Rebels, Two for droids and creatures, and Three for Imperials, although that numbering scheme isn't always adhered to. *Source: Star Wars: The Action Figure Archive
The original version of Luke Skywalker in Stormtrooper Disguise was noted as Collection 2 and later changed to Collection 1.