While a bunny and his mother shop in a grocery store for lunch guests, the reader may count and compare the amounts of carrots, peanuts, and worms in the grocery carts of other shoppers.
Miss Mackle's third graders share December holiday traditions--Christmas, Hanukkah, Kwanzaa, Three Kings Day, and Korean New Year--with each other and with Harry's great grandfather, who has just moved to a nursing home.
On a class trip to the pumpkin patch, Froggy exuberantly picks a pumpkin in hopes of carving a jack-o'-lantern, making a pumpkin pie, and possibly winning a prize in his class's pumpkin-picking contest.
When Horrible Harry's pet cat, Googer, sneaks a ride and gets into the school building, third-graders Harry and Doug have to catch him before anyone else does, which means going into some forbidden places.
Froggy is excited for the Winter Carnival to start, and it's even more fun that he expects. He has so much fun building a snow fort and a snowman, sledding, and even having a snowball fight!
When Froggy, Mom, and Pollywogilina set out for the library, Froggy brings a wheelbarrow to hold all the books he plans to borrow but he is so excited that he forgets to use his indoor voice.
Rambunctious Froggy hops out into the snow for a winter frolic but is called back by his mother to put on some necessary articles of clothing in Spanish.
Spring becomes a memorable time for Miss Mackle's second-grade classroom because of the antics of Horrible Harry and the special insights of shy Song Lee.