The input field inside EntryElement is created with an incorrect frame which causes image distortion on iPad 2 (at least). The problem is that frame's y coordinate is not an integer. Here is how it is calculated (MonoTouch.Dialog/Element.cs):
float yOffset = (cell.ContentView.Bounds.Height - size.Height) / 2 - 1;
I believe it should be like this instead:
float yOffset = Math.Round((cell.ContentView.Bounds.Height - size.Height) / 2 - 1);
You can see the distortion especially well if you turn on Color Misaligned Images option in the Device Emulator.
Created attachment 20156 [details]
I can confirm this issue still exist