This page is dedicated to blind bag errors and variants. Do you have a pic to add? Let me know and I can add it here.
From left to right we have:
1. Pink Twilight Sparkle with no cutie mark or glitter
2. Rainbow Dash with no cutie mark or glitter
3. Pinkie Pie with no cutie mark or glitter
4. Pinkie Pie with Crimson Gala’s cutie mark
5. Crimson Gala with Pinkie Pie’s cutie mark
On the left is a regular Sky Wishes, but on the right, Sky Wishes has Ploomette’s head. The paint for Sky Wishes appears to have been painted on Ploomette’s body by mistake. Thanks to dede88 on MLPArena for spotting this.
Skywishes and Gardenia Glow both come in slightly different colours some of the time. On the left is the Toys R Us ponies, and their wave 5 counterparts are on the right.