The Thrice Cream Man/The Flibber-Flabber Diet - S1-E7
Other mistake: In "The Flibber-Flabber Diet," Chowder and Truffles return when Mung calls them. How could they hear him when they'd already left?
Chowder (2007)
1 other mistake in season 1 - chronological order
Starring: Tara Strong, John DiMaggio, Dwight Schultz, Nicky Jones
Burple Nurples/Shnitzel Makes a Deposit - S1-E2
Continuity mistake: In "Shnitzel Makes a Deposit", Truffles tears off a check from a checkbook and gives it to Shnitzel. A few shots later, the page where she tore off the check is back to normal.
Grubble Gum/The Cinnamini Monster - S1-E3
Mung: We need more spice!
Truffles: Well, I'm glad one of us finally acknowledged it.