A single, neon-blue feather was found near the dessert carriage. It didn't belong to any of the suspects.
Rainbow Dash later admitted she had "scouted" the room three times before the crime even happened, just to check the cake's structural integrity. [S2E24] MMMystery on the Friendship Express
They lobbied for the invention of the "Anti-Pinkie Pastry Vault." A single, neon-blue feather was found near the
While Pinkie Pie was playing Sherlock PONY, Celestia’s Royal Guard was secretly frantic. [S2E24] MMMystery on the Friendship Express
According to behind-the-scenes Equestrian lore, here is the "untold" side of that sugary crime: The Secret Security Detail
Break down all the to Sherlock Holmes and Hercule Poirot.