It's minor things, but very annoying.

1. When the battle is finished and I am back at opponent selection screen, I can start scrolling immediately, but in about 1 second, the list scrolls back to the top and I have to scroll again.

2. When the battle is finished and the victory screen with "Tap to continue" message pops up, "tap to continue" doesn't work immediately - it takes a second to start reacting to taps. What this means is I often tap and then wait a few seconds, until I realize that it did not register my tap and I have to tap again.