What's the Big Frigin' Difference?!

8/6/2016 7:45 AM PDT

What's the Big Frigin' Difference?!

In case you need an excuse to stare at shirtless shots of Olympic gold medalist Michael Phelps -- we’ve slipped in some subtle changes for your viewing pleasure ... race through the pics and see if you can spot the differences between these two swimming snaps. 

**HINT -- There are THREE differences in the above photographs!**