What Does Blue Want to Build? - S2-E2
Revealing mistake: When Mailbox first comes in, you can see the letter being moved into place behind Mailbox due to a small part of him being cut off. (00:13:00)
Blue's Clues (1996)
1 mistake in What Does Blue Want to Build?
Starring: Aleisha Allen, Steve Burns, Seth O'Hickory, Traci Paige Johnson
Steve Gets the Sniffles - S2-E1
Trivia: During a mailtime segment, there's a rare Blue's Clues poster visible.