Elmer's pickaxe disappears after he fails to hit Bugs with it.
Elmer digs a hole with his pickax. He then turns to grab a stick of dynamite out of a box of dynamite. He lights it and drops it into the hole he has just dug. Then the camera vantage point changes to show him running from the hole and the impending explosion. But when that vantage point changes, the box of dynamite is no longer there.
The tooth Elmer is holding is a molar, but the missing tooth is an incisor.