When I bring up the statistics with F3 then quit the game and join again, the slow motion camera effect that's used when the statistics are brought up is still in effect when I load up another save. This affects Survival and Creative modes as it works when you quit a game and load up another save of either type.

To reproduce:
1. Load a game
2. Bring up statistics with F3
3. Without closing the statistics, go to the menu and click "Save and quit"
4. Load up the same or different save. Move the mouse and you can see the slow motion

The only fix I've found is to close Minecraft completely and restart it.