If you pay close attention to the opening credits, below the credit of "Burl Ives sings", you'll see a small house fly buzzing around on the fake snow!
In the end credits, you can hear a whooshing noise. This is from the original 1964 end credits before the misfit toys were picked up. The whooshing is from the elf throwing presents out of the sack with the credits written on the boxes!
During the closing credits, we see the elves drop off the Misfit toys at their new homes by giving each one an umbrella, and after the credits are over, Santa Claus says "Merry Christmas" and flies away.