The Itsy Bitsy Spider/Heartwarming

Tropes exclusive to the short:

 * Leslie is happy when she first met Itsy.
 * At the end of this short, Leslie was reunited with Itsy in the happy ending.

Tropes exclusive to the series:

 * In the episode, "Sugar-Coated Spider", Leslie happily hugs Itsy in her daydream. Three times cute. See the image here.