It's our friend Mailbox's birthday and we need to figure out what his favorite birthday game is. We also complete sprinkle patterns on his birthday cake, find the best present for Mailbox, then wrap it with different colored wrapping paper and different sized bows." I see. Who is purple, has a flag, and can't wait to come over every day? Do you know? Oh yeah, Mailbox! It's you!

This is the fourth episode in which there are r a i n b o w-colored instead of blue cups. The first three being Happy Birthday Blue, Blue's Big Neighborhood Adventure, and Mystery of the Missing Pies. In What Was Blue's Dream About?, Blue howls out the last "Mail" in a very high note in which Steve/Kevin/Duarte/HyunShup Shin's voice appears to be in a slightly lower volume than usual. The 2002 studies demonstrated that experience with watching one TV series affects how children watch other programs, especially in the way they interact with them. [141] They also showed that since children are selective in the material they attend to and that their interaction increases with comprehension and mastery, children tend to pay more attention to novel information and interact more with material they have seen before and mastered. According to Crawley and her colleagues, Blue's Clues demonstrated that television could empower and influence children's long-term motivation for and a love of learning. As they stated, "One need only to watch children watch Blue’s Clues to realize that they respond to it with enormous enthusiasm". [146] The Spice Family, also known as the Shakers, are a group of condiment dispensers who live in the kitchen, each named after the type of spice they contain. For the first four seasons, there was no actual episode title (With the exception of " Blue's Big Musical").This is the third time where Steve, Joe and Josh appeared together. The first two being Meet Josh! and Blue's Night Before Christmas. When Steve and Blue look at possible presents for Mailbox at the present store, a boom mic can be seen.

Pearl (voice by Sadie Trant) is a clever and cheerful bunny who has albinism and nystagmus who debuted in "Something New at Blue's School". Steve's and Joe's Grandmother - The grandmother of Steve and Joe, and the grandaunt of Josh. She wears a green striped shirt like Steve. Kirkorian, Heather L.; Ellen A. Wartella; Daniel R. Anderson. (Spring 2008). "Media and Young Children's Learning". The Future of Children 18 (1): 39–61 doi:10.1353/foc.0.0002 It is located in the Living Room Picture Frame, the same area as the Present Store from the original episode.After the credits, Blue who's chasing her ball kneels down and barks. And then the book closes, leaving magic sparkles. Wynonna (played by herself) is Green Puppy's owner and Steve's friend; she and Green Puppy celebrate Christmas. Like most of Steve's live-action friends, she is only shown in one of the Christmas specials, "Blue's Big Holiday". Blue's Birthday" (Pin the Flag on Mailbox) [Note: the tune is similar to that in Mailbox's Birthday] [ ]