When Wally and Gail are sitting in the booth at the coffee shop, there's a trophy on the shelf beside them. It's the same trophy that Wally won, and Beaver broke - and attempted to fix - in Beaver Gets Adopted (1959). There, the shop teacher at Wally's school fixed it.
The sentiment presented below Gail Preston's picture in the yearbook is the first two lines of "She Walks Like Beauty," composed in 1814 by the Romantic poet Lord Byron. The poem is often considered one of his most famous works.
When Eddie opens the yearbook to show Wally what Marjorie looks like, the two girls pictured at the bottom of the two pages are also both on the far left side of the pages when Gail's picture is shown.