Device: iPhone 4s and iPhone 5
iOS: 7.0.4, 7.0.6, 7.1.1, 7.1.2, 8.2
Description: Control center is shown coming in from the side of the screen.
Cause: Turning on orientation lock.
Recreate By: Open the notes app with orientation lock off and rotate your device to landscape mode. Open the control center and turn portrait orientation lock on. Then pull the control center part way down the screen.
The screen shots above are from the notes and messages apps, respectively, but this anomaly also exists in the mail app and others.