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)
Steve Gets the Sniffles - S2-E1
Other mistake: During the mailtime segment, as Mailbox moves closer to Steve, a big chunk of him is cut off. (00:12:50)
A Snowy Day - S1-E10
Revealing mistake: During the mailtime segment, when Mailbox shakes snow onto the chair, a small part of him is cut off, and you can see the letter being held behind him. This also happens when Mailbox opens his door, and you can even see a crew member's hand move away as Steve grabs the letter. (00:17:38)
Snack Time - S1-E1
Visible crew/equipment: After Steve skidoos into the farm, the boom mic dips into view above his head. (00:15:46)
A Snowy Day - S1-E10
Other mistake: When Mailbox comes in, he shakes some snow onto the chair. When Steve brushes it off, the snow stays visible on screen, then disappears mid-shot. (00:17:43)
What Is Blue Afraid of? - S1-E18
Other mistake: Steve finds the second clue, which is the shadow of an owl. The owl is on a tree branch, but there is no tree shadow that the branch shadow is attached to. A floating tree branch? (00:06:41)
What Is Blue Afraid of? - S1-E18
Other mistake: Shovel, Pail, and Steve see a shadow, then figure out it's the shadow of a tree. Then, when the red bird comes and lands on the tree branch, the bird's shadow is reversed, with the tail facing the opposite direction. (00:05:58)
What Story Does Blue Want to Play? - S1-E16
Revealing mistake: When Blue wants to play Blue's Clues, the paw print is off-model.
Revealing mistake: The first clue, the boots, are cut off to the left.
Snack Time - S1-E1
Revealing mistake: When Steve skidoos back to the thinking chair, the tree branch is cut off.
Snack Time - S1-E1
Revealing mistake: When Steve skidoos to the farm, there is a white border around the screen.
Revealing mistake: In the intro of this episode, a glitch is visible.