In an ad promoting a Toys R Us and WWF partnership in the March 1991 WWF Magazine, tag team sets of Demolition, The Bushwhackers, The Rockers, and Rhythm and Blues appeared. The Rhythm and Blues set was never released, however both the Honky Tonk Man and Greg "The Hammer" Valentine did see singles action figures released. Honky Tonk Man, as he appeared in the ad, was released in Series 2, however Valentine's figure in the advertisement appeared in his Rhythm and Blues attire, black hair, white jacket with black musical notes on it, white boots, and black trunks, whereas the figure released of Valentine in Series 3 was in his most regular singles attire of blond hair, black trunks and yellow boots.
Fueling further collector speculation is the fact that on the back of some early foreign card figures, Rhythm and Blues was listed as an available tag team set. It is unknown the exact reason this figure went unreleased, but it is assumed that it was that the tag team had broken up a few months before the ad was printed. The Rhythm and Blues Greg Valentine is a hot topic of conversation among WWF Hasbro collectors because it is one of the few prototypes that have not turned up in a private collection. Valentine himself has increased speculation on the whereabouts of the figure, giving conflicting to reports as to where the prototype(s) may be in various interviews.
Shawn Michaels' Yellow Carded figure appeared in both print ads and on card backings using the spring-loaded armed feature found on the Virgil, Jake "The Snake" Roberts, El Matador, Hulk Hogan #4, Papa Shango, Ted DiBiase #3 and Billy Gunn but was changed to his released form.
Randy Savage from Series 1 appeared in the 1991 J.C. Penney catalog in green trunks as part of an offer selling a ring and both Hulk Hogan and Savage action figures. Savage was sent out in his regularly released orange trunks. Both Shawn Michaels and Razor Ramon figures resembling those released on both Yellow and Blue cards have appeared in an unreleased print ad promoting the figures as mail-aways as a reward for collecting Hasbro points found on the back of the WWF Hasbro Cards.
- Series 1 saw only one change in the line when compared to the press photo shots of the prototypes; Hulk Hogan's shirt features a different font than the one that appeared on the final product.
- Series 2 featured the unreleased Greg Valentine as well as a minor adjustment to Dusty Rhodes' expression.
- Series 3 featured the Ultimate Warrior with yellow and white face paint on the prototype instead of yellow, purple, and white as he was released and the Texas Tornado with red and white tassels on the prototype instead of all red like how his figure was released.
- Series 4's only change was Bret Hart's figure, who went from having silver and pink shades to only pink.
- Series 5's Mountie prototype had a red cattle prod instead of the released black cattle prod and added Virgil's name to his trunks.
- Series 6's Berzerker originally came with no cloak and a 2x4 accessory and Tatanka originally had blue script on his legs
- Series 7 featured Kamala with a moon on his stomach as a pre-production variant but not in the promotional photo. The only changes made from the promotional photo were that of Owen Hart's final baggy pants and Shawn Michaels was changed from his original action of that of the Jake Roberts, Hulk Hogan # 4, Virgil, Papa Shango, El Matador, Ted DiBiase # 3 and Billy Gunn figures to "Conceited Crush" action and a plastic gold chain was added to Razor Ramon when released (who also had no stubble).
- Series 8 saw no major changes from the prototype images.
- Series 9 featured changes to three figures. The original Rick Steiner prototype featured two differently designed boots, the original Doink the Clown design featured green pants with red stars, and Brutus "The Barber" Beefcake was originally slated to be in the line, but was replaced by a re-release of Series 6's Tatanka.
- Series 10 saw no major changes from the prototype images.
- Series 11 saw no major changes from the prototype images.
Commonly Traded Error Cards and Variants
Series 3's Sgt. Slaughter is a popular variant, offering a variant that features no name listed on the front of the card. This variant is very rare and is believed to have seen limited release in the Tri-State Region.
Some of the more common error cards include "Rowdy" Roddy Piper on a Series 2 Ultimate Warrior card, Billy Gunn on a Bart Gunn card, Bart Gunn on a Billy Gunn card, Giant Gonzalez on a Samu card, and Series 1 Ted DiBiase on a Rick Rude card.
Other rare error cards include Bret Hart 1 carding with The Undertaker 1 Figure.