Continuity mistake: When we see the boomerang box, there are words on the side reading "One Boomerang" and "Returns to Owner." When we see the Coyote holding the boomerang in the next shot, both the words on the box have disappeared.
Continuity mistake: When the Coyote climbs into the hot-air balloon, there is nothing on the basket, but when we see the Coyote in the next shot, two sand bags have appeared.
Continuity mistake: When the Coyote tests his dart bomb, he lights it with a match in his left hand. But when he throws the dart bomb in the next shot, the match that was in his hand has gone.