How did they do the special effects for u & I???Like Harry and Zayn's special effect for example...when Harry turned around Zayn appeared.So please tell me how they did those special effects.

Oh u mean when they all morphed into each other.That part was amazing and I think the director and editor must have used a special type of computer to make the guy's images,I'm not really sure.And if u want to know what those frozen figures of them were,they're called freeze frames.

The director and the editor must've used maybe a special computer and used their afbeeldingen to make it look like they turned into each other.