Hit reindeer
When the deer appears on the screen, get the arrow to the last one on the left. The elves will yell, but the ball will fly off and hit the deer in the head.

Kill frog
When the frog appears, make sure it is in the middle. Then, get to arrows highlighted by the frog. The frog will let out a pool of blood.

Easy strikes
When you are about to bowl press [Ctrl] + X to get a strike every time unless the head pin steps to the side.