WWF Royal Rumble
Wrestle as Shane McMahon:
Beat Royal Rumble mode on easy or hard difficulty setting.
Wrestle as Vince McMahon:
Beat Exhibition mode on easy or hard difficulty setting.
Knock The Referee Out:
Use a weapon and hit him twice. If you can pull this off you will get a message stating "The Referee Is Knocked Out". You then have 10-15 seconds to beat the daylights out of your opponent without hassle from the referee. This also works if you want infinite double team time.
You can change the Background by entering the Ranking Section and viewing every section. When you return to the Main Menu you will have a different background image. Continue to do these steps and the backgrounds will change every time.
Hold Block and repeatedly press the D-pad in all directions. You will dodge every time your opponent punches or ties to grapples.
Win the 100 man royal rumble without being thrown out and from the character select screen hold Start on the character you want and then select them. You will now control the character but with their alternate costume.
Thanks to Revolution readers The Aj, Dave Beeston, Graeme.L.3:16 and Jwyanza!