Revealing mistake: Season 3, episode 1, "A Tale of Two Cities.": In the scene where Ben/Henry is presenting a breakfast table to Kate, he mentions coffee which we can see is in a French press. Ben/Henry "finishes" the coffee by pushing down on the plunger of the french press, but uses only one finger with barely any pressure. In reality, a french press takes a significant amount of pressure to get the plunger from top to bottom, more than could be generated by just one finger. Additionally, we can see that the mesh-screen component of the French press stays at the top, rather than plunging down, which it should in order to filter out the grounds.
Tricia Tanaka is Dead - S3-E10
Revealing mistake: When the VW bus is driving down the hill, in a few shots, Charlie is missing from inside the VW. (00:34:50)
Revealing mistake: When the crew member of Expose shouts "cut," a tape marker can be seen where he stands for the shot. This could be argued that the marker is from the TV show being filmed; however, the marker is used by someone not being filmed for the TV show. (00:02:10)
Answer: He was eating a peice of an orange with the skin still on.
XIII