Kenny Kim is credited for the voice of Periwinkle, even though Periwinkle does not appear in any part of the episode other than the opening sequence. (edit) The Intrepid Sea, Air, And Space Museum receives a Special Thanks credit. (edit) Mailtime Segment: Mailbox says that there's something inside him for us. It's a letter. Steve opens the envelope, only to find another envelope inside, followed by a third envelope. Finally, we get to the letter, in which two kids go inside a submarine. They visit the control room, check out the periscope and see where the sailors eat and sleep. (edit)

Steve: So, some squirrels live inside trees. Good to know. (edit) Steve: Blue, you've got a book. That's one of my favorite things to look inside. (edit) Mr. Salt: Which one of these lovely items belongs on the red shelf?
Steve: Uh, the red shelf. Um... uh, I don't know. Mr. Salt, I think I'd like to ask a friend. (edit) Steve: Um, Mrs. Pepper, we think it's the apple.
Mrs. Pepper: The apple, is that your final answer? (edit) Steve: Doesn't seem to be anything inside here.
Kid: A clue.
Steve: Stew? There's stew inside this box? (edit)

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Mrs. Pepper / Steve: Final answer? ... Ask a friend
The "Grocery Game" in this episode is a straight-up parody of Who Wants to Be a Millionaire, complete with pulsating music in the background. (edit)