There might be more, but I refreshed for a few minutes and these seven were the only ones that popped up. I have a couple of Red Sox GIFs in my personal collection, and I'd like to suggest that MLB add these to the rotation:
Kelly Shoppach's failed slide.
Daniel Nava after completely losing a fly ball.
Dustin Pedroia reacts to being hit by a pitch.
And Salty totally incapacitated by laughter during photo day.
Are there any memorable errors you'd like to see immortalized in GIF form on the MLB.com redirect page?