Harry Potter: Return To Hogwarts: Fans Outraged After Reunion Gets Actor's Name Completely Wrong

Daniel Radcliffe, Emma Watson and Rupert Grint, as well as a number of other Hogwarts alumni, appeared in Return To Hogwarts, as they reminisced about growing up on the set of the famous film franchise.

Also returning to discuss the wizarding world were James Phelps and Oliver Phelps, the twins who played Ron’s cheeky prankster brothers, Fred and George Weasley.

However, a captioning blunder unfortunately saw the twins mixed up, with the pair both labelled as the other twin when they appeared on screen.

Taking to Instagram, Oliver, 35, saw the funny side of it all, and suggested the mistake was done deliberately.

“I guess after all those pranks over the years somebody decided to get their revenge,” he wrote. “It was fantastic to be part of the HP reunion. Hope you all enjoyed it.”

But fans were less impressed, and vented their frustration on Twitter.

“Someone switched the Phelps twins' names. What a mess,” complained one viewer.

The people behind the Harry Potter reunion had one job and they couldn’t get…the twins’ names right. In the words of Ron Weasley, bloody hell!” said a second.

“It triggers me so hard that they got the Phelps twins' names wrong,” fumed a third.

While the actor was discussing her childhood, fans were left bemused as a picture of a young Emma Roberts, the American film star, was used erroneously.

Return To Hogwarts is available to watch now on Sky Max and NOW.