Gettysburg - S8-E8
Continuity mistake: While Andy continues the tour, Gabe stays behind to perform as Abraham Lincoln. Later on we see Gabe with the others, we even get a close up. A while later, when everyone is tired and sitting on the grass, Gabe doesn't seem to be there. Eventually the episode ends with Gabe finishing his performance.
Answer: In the 2007 episode "Ben Franklin" when Jim is talking to Pam there is a candy bar with a purple wrapper that says "Picar-" I assume picaroon, it's hard to see past Pam. I found this trying to investigate what that candy bar is lol.