Sometimes the Parallax effect doesn't work. There is also a major bug affecting all iOS devices that are on iOS 7.1. That bug is called the new shift key and it is very confusing.
At settings/sound/sent mail- listening any ringtone while vibration is turned on, only works ringtone, no vibration reaction
And randomly Safari crashes, yes I'm still getting safari crashes on my 5S. Atleast not so often with 7.1