The bucket that Donald drops after whacking the flagpole with it makes a brief reappearance in the next shot, after he falls to the platform - then disappears again. (Arguably, it's a different bucket, but it still disappears without reason.)
While Donald Duck is hoisted up on a platform singing, the person with the garden shears clips Donalds hat and his tail feathers exposing his tail. In the next shot Donald Ducks tail feathers appear as though they have never been cut.
After Spike the Bee stings Donald Duck, the bee disappears in the next shot after Donald Duck gets stung and unraveled from the platform.
After Spike the Bee stings Donald's rear end and causes him to get unraveled and freed from the roped platform and dive into the drainpipe. You can see Donald's beak is wide open as he screams just before his body dives into the drainpipe headfirst. Donalds beak would've stopped him from entering the drainpipe yet somehow, he still enters the drainpipe and his body inside slides all the way to the bottom and his beak appears undamaged.
After Donald Ducks head comes out of the bottom of the drainpipe. Donald yells at Pluto the dog for help. But Pluto ignores Donald and shoves his foot, right in Donald's face and traps him inside the drainpipe. If this happened, Donald Duck would lose air in a matter of minutes and would likely suffocate and either pass out or die unless Pluto moves his foot out of the drainpipe hole where Donald's head is so he can get air. Also Donald Duck would starve or thirst to death if he doesn't get out of the drainpipe and get something to eat or drink.
After Spike the Bee stings Donald Ducks exposed rear end, Donald jumps and he spins getting untied out of the roped platform until he's out but he dives into the drainpipe and only his head comes out. Donald Duck yells at Pluto the dog but Pluto shoves his foot in Donald's face back in the Drainpipe trapping Donald in the drainpipe and falls asleep. It's unknown if Donald Duck ever got out of the drainpipe or if a person comes to help Donald out or if Pluto the dog decides to help get Donald out of the Drainpipe.